I got mine a few days ago and am really pleased with it. I dont want to rag on WinMo because it was never designed for touch use alone. HTC and SPB etc have tweaked its interface to give it some touch functionality, but underneath its similar to winmo 2003 in some places and very much focused on stylus input. Since the iphone and android, the market has shifted towards touch functionality, so it's expected that winmo 7 should be more touch friendly. MS have already proven they can do it with the Zune HD interface, so time will tell how successful they'll be with winmo7
I'm glad I didnt fork out for the Hero/Dream/Magic as this device fits the price range and form factor(size) that I want. The sense UI is great and even with resistive touch, navigation and texting is easy. Unless you have delicate and nimble fingers, I'd suggest using keypad mode for typing in portrait mode or just switch to landscape. The phone does this automatically (with the help of the camera) but this is a bit slower than devices with an actual accelerometer. Typing in landcape is cool, and easily managed on the QWERTY via thumbs.
I have a few games on it, and have noticed that the bottom of some games cant be seen. For games that work in landscape modes >> if there is anything needs to be seen on the far right side - you wont see it ! The games I've played arent really affected, but if you really want to get stuck into games, you may be better off waiting for the Eris device or forking out for one of other devices with a larger screen.
All in all, the Tattoo/Click gives you satisfying android experience - but in a small form factor and lower price. It of course goes without saying that some of the bells and whistles present in the more fully featured devices are missing.
As I have an asian device, I also did not get access to the market by default. You can get the 1.6 (donut) market aka vending.apk from xda devs but I havent been able to access the store on it - the interface yes but not to actually download anything. I'm in Oz, so users from other territories may have more luck.
Barring that the only way to access particular apps will be to flash your device with an upgraded offical ROM, or one that includes the android market apk by default - HTCpedia contains some official roms but the versions numbers of these were less than my device so I could not update. Also, from wandering around the usual haunts, no one has figured out how to easily 'root' the Tattoo (yet).
The other source for apks you cant get to on slideme isnt really worth mentioning here
Here's some useful links for those with/considering this device:
*Comprehensive video review (eng) >>
HERE
*HTC have finally launced the shell customisation store >>
http://www.tattoomyhtc.com/
Astro