have been using the 9900 for a couple of weeks. Got it almost as soon as it released. Typing is a joy. I had got used to my 9700 but once i used 9900, my fingers just flew and they loved the softer touch.
Touchscreen is a boon, though it takes time to shift from using the trackpad to using the screen. In some cases the trackpad is actually faster. Its also a pleasure to browse - brilliant colors. and i guess the small screen helps to conserve battery - which is the one big grouse I have. The battery gets drained really fast as I use it - especially on 3g usage.
Processor speed and memory really shows. I can happily install many apps without bothering about eating up memory.
However today I just ran into a JVM 517 error and I am just not able to get it out. Am looking at installing some other vendor os. Let me see if i can get it back else it is just bricked. As i browsed the net, i found that 517 usually is a hardware error and no point in reinstalling the os. I guess the launch was a little premature. Maybe its a good idea to wait for RIM to iron out the kinks.