Pretty great service, if you're not in the middle of nowhere with crappy internet. $20 a month is reasonable for the amount of games offered. Trophy support was unexpected.
The games launching instantly is really cool, but if you have a poor connection it won't be very fun. I was able to play, but it's like watching YouTube in 260p or something. On the plus side, I was finally able to play Tokyo Jungle, which I must say is probably the dumbest game that I've ever really, really enjoyed. It's basically Metal Gear: Animals, and I love it dearly.
I'm going to just play Tokyo Jungle through to completion and cancel the trial. If I end up moving somewhere with better internet, I'll probably re-sub. The 3-month option is reasonably priced, and I imagine they'll do a bundle somewhere down the line with PS+/PSNOW.
Overall, impressive. People with good internet, is the streaming consistently 1080p quality, or are you catching crappy pixellated moments as well?