Welcome, Whittler.... Mine is an iPhone 4 as well, and it works very well. Looking forward to the iPhone 5 later this year (I'll be eligible for an upgrade) and will use my 4 as an iPod (I think it works that way...).
Hey Whittler. I started with the 3g also and went to the 4 a couple years later. Since then I have bought a 3gs and another 4 from friends that went with another brand. There are many good people on this forum to learn from. I know I'm happy I joined.