I got this S90 after reading Rockwell's review, but not because of it. The features that caught my attention were the control ring in the front (the first in any camera), the quality F/2 lens on front, and the larger sensor. I was sick of having cameras that just wouldn't perform well in low light, and yet didn't want to haul around a DSLR for that purpose. Now I try to remember to bring it any time I go out.
As for the feel, it's like all the LCD-only Canons of that size, only it has the control ring on front that gives you two methods to change the settings without menus. Beautiful large LCD too.
The S95 adds some nice features, but not really ground breaking. The rear wheel isn't "loose" like the S90 which could lead to accidental rotation, and there are some features like its supposed HDR support and "hybrid IS" that are supposed to improve photography, but they're not deal making for me. They also have the HD video and stereo audio, but video doesn't matter much to me. The S95 is about $100 more than the S90; you'll have to judge whether those added features are worth $100 more. I'm pretty satisfied with the performance of my S90 and would definitely buy it again. It also survived dust storms in Burning Man, when other cameras didn't, and that was while taking photos during them.