I was fortunate that T-mobile gave me an extended time til the 7100 came out to be about to trade my 7230 for the 7100 if I wanted.
Today I went to the T-mobile store and switched sim cards to the new one. I love my 7230 but I felt that the telephone could be easier to use without an earpiece (volume etc)....
I found out that the 7100 was slower (the processor was waaay underpowered), the logic was worse than the original, the suretype was ok no faster no slower just different and I am sure in an hour it would have been cool.
Overall there was NO compelling reason to change and i only saw downsides...without any upsides except for a cooler look.
I get 300 e-mails a day and use 5000 minutes a month...I need functions and so "cool" does not matter when i am talking service 24 hours a day to reach and be reached by my clients around the world.