I keep hoping one of my Cakewalk friends will buy this and give a review of it.
http://www.guitarcenter.com/Sonuus-i2M-Musicport-Universal-Midi-Converter-and-USB-Interface-107407405-i1709789.gc
 

A fellow Sonarite (smallstonefan) has ordered this and it looks to be a real cool midi controller.....with also a higher pricetag it comes.... 
 
I hope he gives us a review on this after testing it out.....
http://www.gizmag.com/misa-digital-tri-bass/28662/

If we are are taking a look a at the big league ... and price tag ...(and recognising it’s a midi controller - whilst similar to a guitar it’d have a different playing technique).
 
Pendulum’s Rob Swire use(d/s) Starr Labs Ztars (incl Z6S-XPA)
http://starrlabs.blogspot.com.au/2011/05/new-ztar-for-rob-swire-of-pendulum.html
http://www.starrlabs.com/index.php?route=product/category&path=59 
 
In Action:
https://www.youtube.com/watch?v=pVI-fMA7qW0
(notice he plays it more like a keyboard, seldom strumming if at all, but using a control knob for modulation).
Plenty of ‘hits’ on Youtube. 
 
He use(d/s) Z3TA too :)
http://www.soundonsound.com/sos/jun08/articles/pendulum.htm
http://www.musicradar.com/news/tech/in-pictures-pendulums-studio-and-live-setups-323465/4 
 
A bit OT but interesting - Studio interview hands on insights
https://www.youtube.com/watch?v=WqmFl_tOvc0 
 
[Update] ... or the more affordable iTar on presale:
http://www.starrlabs.com/index.php?route=product/product&path=67&product_id=69
 

I have the Roland GR-20 with the GK3 Divided pickup. I always run my strat straight (bypassing the GR20) and the synth out separately (2 cables from the guitar).
 
I'm a total junky. It's the pedal I never put away. My foot is on it right now. I was just looking at the GR-55 which has looping and stuff. I tend to use my old boss looper, but it would be nice to have looping in the unit.
 
I've just checked out the owner's manual here...
http://www.rolandus.com/products/details/1148/support/
 
It is pricy. I'll give you that.
 
But it's sooo much better than the midi that get's produced by the same unit. It's really fantastic at tracking the sound. I regularly record the Midi from the GR20 along with the guitar direct to my interface and the left and right from the GR20 direct too. It's a ton of fun. The midi isn't as good as the GR20 at detecting and responding to pitch bends and slides. Subtle differences.
https://www.youtube.com/watch?v=r335J6CILig
 
I installed mine myself. I will say that if you're in a hurry for a gig, idk if I'd try it. It took me some time to really learn to set it up and be comfy with it on stage. There's a lot to know in the old GR-20. From the patch list for the GR-55... oh my.
 
 I took a vocal from a December Jam and pieced it together in this midi guitar lighthearted tune making tonight...
http://stabilitynetwork.blob.core.windows.net/g-tunes/20131218_PaulReb_03_LongWayHomehaha2.mp3

http://forum.cakewalk.com/GR20-decay-envelope-controlling-synth-parameters-in-Sonar-m3046149.aspx#3046149
 
I posted a new thread showing how to use the decay envelope from the GR20 to control synth parameters in Sonar.

I have a GR-9 (yes quite old) which I think should work. When I have some time, I'll tinker with it and see if it can be used.....IIRC, the response wasn't that good, BUT wasn't really bad either. Like you said gswitz, it needs to be set up properly first.