Well, I am satisfied with it. We all complained about multitasking and we got it finally. For me the notifications never really bothered me much. I guess having something more appealing like the android would be pretty cool. One thing I would have been extremely pleased with, is having the icon on the top of your screen of what you have waiting to be opened. I.e. email, texts, etc. I enjoyed having that from JB. I would be really happy to see us be able to invite attendees from our calendar. I used this feature a lot in BB, but it's not the end of the world for me. I just have to remember to do it from my mac when I get home. In app SMS, I definitely hope this is more like reply directly from the app instead of having to close it out and go into messaging. One huge miss for me is the LockScreen. It just made me so much more organized being able to see everything in one screen and WHENEVER I needed it was great. But i'll take what I can get for now, and look forward to June to actually try it out.
On another note, RadioShack has a great Trade in Program that you can take your iphones and use towards new the G4, or for 3g owners towards 3gs! As of right now you can get almost $200 bucks for a 16gb 3g. If you have a 16gb 3GS you can get up to $341!!!! 3g owners should look into if they want to take advantage of the new 4.0, especially if the prices go down for the new iphones launching this summer.