Got one of these brand spanking new thingys last week:
 
http://www.bossus.com/gear/productdetails.php?ProductId=1319
 

 
I'm behind on sleep, my fingers hurt, but I don't care.
 
 
It's the newest 13pin synth/guitar modeler/FX thingy. I got it mostly for the synth stuff, which is done by morphing your guitar sound somehow, not triggering samples, so it works quite well.
 
There are some good examples of some lead synth sounds here, but unfortunately I can't download them because the editor SW isn't out yet ("coming in July" they say):
 
http://bosstonecentral.com/liveset/detail/gp-10_synth_lead_collection/
 
 
I didn't get it for the guitar modeling stuff, but some of it is actually quite good.

Congrats Drew!!
 
I don't know much about the GP-10, but the first thing I looked for was a MIDI connection as I also was thinking about morphing the guitar!!! :)
 
I have an old Roland GR-09 Guitar Synth that has (I think) GK-2a pickup......I wonder if my pickup will work with the BOSS?
 
I bet the GK3 pickups are much better!!
 

The GK-2a will work fine. My understanding is that the differences are mainly the form factor - the GK-3 I think just accommodates different spacings and fretboard radius' better and stuff like that.
 
I have a GK2a PU, a Yamaha PU and the GK-3 that came with this and they all work fine - there are settings in the unit to configure it for PU, guitar and mounting variations.
 
The only midi on the GP-10 is via the USB interface, which does both midi and audio - including  separate audio channels for each string.

I have a gr20 with gk3. Did you consider the Roland gr55?

The GR-55 didn't do it for me.
 
I've had a really old GI-10, which is like a 20 year 13pin to midi unit (with no built in sounds) that I've wanted to upgrade for a long time, but nothing up until this was worth it to me.
 
Generally speaking I'm not really into making a guitar sound like a piano or whatever, but more the synthy stuff. The '55 was just too big and expensive for what it did for me and I felt like the PCM engine was a bit lame by today's standards - likely because they dumbed it down too much for guitarists not hip to synth programming.
 
This doesn't have the PCM "triggered" synth stuff and is smaller and cheaper than the '55. It's really more like a scaled-down VG99 than the GR series, so it has the Variax-style modeled AC/EL/bass guitars along with the COSM synth and hex-FX sounds - including a reasonably powerful new "OSC synth" mode along with some other new and/or improved stuff like the hex audio interface and a 1/4" input giving you the ability to use the multi-FX on a standard guitar.

Cool.
Let's hear something you're doing with it.
 
 

spacey
Cool.
Let's hear something you're doing with it.

So far I'm mostly just fooling around with the presets. Some of the presets are good and others are OK or do give one an idea of what it's capable of (though stuff like "LASER BEAM" isn't of any real use). But most need to be tweaked one way or another - some just need to be EQ'd, but many are overdone or way overly wet/distorted for my tastes as is often the case with Roland/Boss demo patches. Apparently I'm not as fond of gobs of chorus/reverb/distortion as they are. Hopefully the editor/librarian SW will be released soon.
 
I did modify or program a few of my own and surprisingly, though I really bought it for the synth stuff, I find one of my favorites uses the "resonator" acoustic guitar model and I can use one of the foot switches to put it in open-E tuning. I am having much fun attempting to play slide guitar with it, even though I've never been much for slide playing either. Trust me you really don't want to hear my slide "playing". But I have decided that learning to play basic slide in unfamiliar altered tunings might actually be worth my trouble.

I woodn't know what to do whiff dat.
 
It don't say Alembic on it. 

bapu
I woodn't know what to do whiff dat.
 
It don't say Alembic on it. 

You could make a bass patch whiff it and name it "Alembic" and tune every string to Am. 
 
But I didn't like the bass patches nearly as much as a real bass.

drewfx1

spacey
Cool.
Let's hear something you're doing with it.

So far I'm mostly just fooling around with the presets. Some of the presets are good and others are OK or do give one an idea of what it's capable of (though stuff like "LASER BEAM" isn't of any real use). But most need to be tweaked one way or another - some just need to be EQ'd, but many are overdone or way overly wet/distorted for my tastes as is often the case with Roland/Boss demo patches. Apparently I'm not as fond of gobs of chorus/reverb/distortion as they are. Hopefully the editor/librarian SW will be released soon.
 
I did modify or program a few of my own and surprisingly, though I really bought it for the synth stuff, I find one of my favorites uses the "resonator" acoustic guitar model and I can use one of the foot switches to put it in open-E tuning. I am having much fun attempting to play slide guitar with it, even though I've never been much for slide playing either. Trust me you really don't want to hear my slide "playing". But I have decided that learning to play basic slide in unfamiliar altered tunings might actually be worth my trouble.

 
Years ago: when they came out I got the GR-30 and VG88 and quickly found out I had very little use for either.
Very expensive to take a chance but I did.
The midi signal was very good with the GR-30 so it was of value to use as trigger for Spectrasonics stuff.
Now either is of much use since with X3 the audio can be dropped into a midi track.
The little use is as you are finding out...I like the sitar in the GR-30 and at the moment can't recall another.
 
Even so...it was great fun and it sounds to me like you scored and that's what counts.
 
I pay attention to warnings and always say thanks.
 
( Trilogy is the only way to go for fake bass IMO.)