I am enjoying it.
No yellow lines or reception problems here, and I've been using it all over town (Syracuse, NY). In particular, I'm enjoying the App folders, newer and faster hardware, the display (OMG it is amazing to look at and a huge difference from the 3G/3GS), and even though there is one person with whom I can do it right now Face Time is very cool, works very well (no stuttering or dropped frames, but we both have Verizon FiOS internet with 25 Mbps symmetrical service), and is a lot of fun.