Well after a couple of weeks of upgrading from my boggo 3G I have to say I'm super impressed.
It's so much quicker, the screen is fabulous, and the battery life is excellent.
This is the iphone that it should have been.
I don't have any signal issues with calls, but I've ordered myself the free case (why not it's free?!). I feel the keyboard is more accurate than the 3G, and it's nice to have 16gb too. Uploaded some movies onto it and it looks marvellous.
Internet speeds seems faster - but that's probably because safari is now performing better.
I love the multi tasking ability - still getting used to it, always forget to do it instead of hunting for the app!
The voice control is a bit tempermental but I don't see myself using it anyway.
Little features like locking the rotation of the display is a nice touch. Not bothered about facetime, but still cool to have the option there - haven't checked whether or not skype works with the camera...
Compared to the 3G this is a different phone altogether. The thing is, I've got so used to the interface now, that going to another phone would be very difficult for me - though I do like my work's blackberry for typing emails on - a nice tactile keyboard is still superior IMO.
I haven't got lots of apps, but all the ones I have work well.
Very happy with it.
Don't really know if I want/need any apps - the problem is there are so many. I've survived for 2 years without lots of them, but now the phone is a bit more capable I should look into them a little more.