I recently did the switch myself this week I am now 3 days into my G1 and I love it so right now, but it is still early. This is the first non BB phone for me and it was hard but I was in amazement with the flow of the touch screen, the fact that it can still have my keyboard and a trackball..... Heaven!!!!
Now I am going to start getting into customizing it so I will l will let you know how well it does.