Dude, it's totally, absolutely, 100% worth it. It was a bit of PITA for me b/c I wanted to install my OS + SRT on the same (80gb) ssd, and even now it's a bit cramped on there, but overall I'm still extremely pleased by it. Performance is somewhere btwn a standard hdd and an ssd, with it generally being closer to the ssd on your most used programs. I've been planning to upgrade to 2x256gb ssd's on BF 2012, but honestly I'm so happy with my SRT setup that I might wait another year.
edit: I've heard conflicting reports on the usefulness of larger cache sizes, but with such a small ssd I'd just use the entire volume for cache when it asks you how you want it set up.