I've had an HTC sensation for about 2 months, and all I have to say is wow. Never had an all touch phone before and was a little anxious about the typing and all of that, but this things on screen keyboard is big enough for my fingers so it's great for me. It doesnt blink no matter how many apps you are running (has a 1.2GHZ processor with 784MB of RAM). OK , on benchmarks it's a little slower than the Galaxy S 2, but the user interface (in my opinion) of the HTC is better.
There are some cons though...
-Battery life is not as good as my ol Nokia e71, I have to charge this every day to day and a half (I use my phone all day long with calls, browsing, email, whatsapp, twitter etc)
-This thing chows data, but luckily I have it synced with my Wifi (which it swaps to automatically when I get home) so updates and big attachments I wait to do when I get home.
I love it though, couldn't go back to anything else. The free apps are mind-boggling.