I agree. My sister-in-law had the Pearl, and it seemed a step down in functionality for sure.I had a "regular" 6000 series with a monochrome screen, a thick heavy beast.
My mistake though, when you said Curve I thought Pearl. I went from a non-roller ball type of BB to the smaller Pearl with the roller ball and there was so much not to like about that move. Had I gone to a Curve, that would have been a real upgrade. I fell for the greater portability of the Pearl. It was that, but so less usable otherwise.