There are some surprisingly poor reviews for this device, I have, overall been very pleased with this device, I got mine through Vodafone and have been using it for over a month.
Yes the device does get warm if you're playing games for a long time, but not to the point of burning my hands, a little warmer than say my nexus one when doing the same task.
The screen is vibrant and responsive, as is the Sense UI.
The battery life, I usually get a little over 24 hours with probably above average use; browsing the web, playing games, watching you tube, making calls, texting/email and I have no problems with any of them. I'm yet to have a go at using the device to connect to my TV to watch a film because you have to purchase an adapter.
The screen shows 4x5 = 20 icons in the apps view, and 4x4 =16 on the various home screens but it does depend on the size of your widgets as to how many you can put in there. The lock screen, quick access feature is great and I use it pretty much every time I open the device to take me to one of my 4 most used areas.
Android is a personal preference I have ipod touches, and I find the android and sense UI to be more to my personal way of using a device, if you're of a similar mind set you'll enjoy this phone, if you love/want an iphone then you'll be dissapointed because this isn't an iphone, I'm tired of apple, windows, android debates, it all comes down to personal preference, what you want to do with the device and how you're used to working.
Final point on signal, I've not had a single dropped call from this device, the device picks up H consistently and is fast at getting email and browsing when I'm out and about, which is an improvement over my Nexus One.
In summary, I spent a long time trying to decide between this and the Galaxy S II, I prefer the sense UI and that's what swayed me to the sensation over the Galaxy as the spec is very similar. If you're looking for a dual core, HTC device with a large screen then I would recommend this device, I'm very happy with mine.