I don't use it for my system drive, but I have a 1 TB Samsung Pro for my larger orchestral libraries (Vienna Dimension Strings, Hollywood Strings, Vienna Special Edition, etc.) and the performance improvement changed my life.  Those libraries were not even usable from a spinning drive.
 
The SSD bought me two things: 1-These samples stream from the disk so I was having major drop-outs and other serious issues until I went to an SSD.  2-And, although this point is more a matter of convenience, a matrix of string sounds now loads in 3-4 seconds instead of 10-12 minutes.

My studio pc consists only of SSD's. It has been a lifechanger Everything runs smoothly...

Another plus for SSDs is in laptops, and not just for speed.

A fairly common laptop failure is caused by people not realising that they aren't really supposed to be moved around much while running. So they get moved or dropped while accessing an HDD and once in a while a disk head hits a platter.

SSDs are immune to that kind of problem.

And they're silent and use less power than an HDD.

Yes, extra bonus that SSD's can run cooler, and therefore quieter . . . not so much fan noise, due to no moving mechanical parts.

Are they now good for audio drives too?

I was gifted a new nachine with 4/500G SSD which I'm planning on building into my next DAW...

But i have been under the impression that they were not good for streaming multitrack audio?

I'd love to find out that i could use all 4 and be that much quieter too!

Not to derail the OP of this thread, but the topuc is right...

Thanks...
Keni

My DAW has several SSDs in it, it works great for me. One for the OS, one for my projects, one for temporary files, and one for samples.  As always, YMMV. 

To the OP. I think you'll find far more of us using SSD than you might have first thought. For many of us we have our Operating System and programs on there while other use them to load sample libraries where streaming needs the fastest throughput. And of course for some they've gone SSD all the way. I'd need 2 TB of drives to do that so it ain't happening because f the cost. I make do with just one 250 GIG SSD for the OS, programs and plugins with all my other data including sample libraries scattered across 3 other drives.

Thanks for all of the input everyone.
 
Have a Great day.

I'll add myself to  the the list of happy people who are putting SSD into all my computers.( I have 6 ) 
Not often mentioned is the fact they use way less power and are quiet. 
There is no need to buy a huge power supply really. 
But I am using the common practice of a SSD OS drive and al else on large TB 7200 drives. 
 
I also re did 2 laptops an ASUS eee net book, and a Sony Vaio both from 2008,,  wow that was a huge improvment to boot up and all proccessing. There is also a small improvement to battery life as a bonus. 
 
Only negitive so far is I have a few IT tech friends and 1 of the 3 is saying there are dependability issues. I have not seen any hint of this myself and this one person must be getting the info from tech forums I guess. That's why I have stuck with the EVO series as I've not heard any neg reviews so far,,, just the firmware bug which was an easy fix. 

Yes - I purchased a Dell XPS 8700 from Costco, which came with a 32 GB SSD Cache drive.
I am far from a computer whiz, but (after cruising the computer websites),  I was able to replace the 32 GB drive with a 240 GB from Crucial and designate it as my root drive.  Windows loads very quickly!