The Pearls are nice, but I'm with Snowy, I think I'd find the keys too small.
I live on my Blackberry and I even find the keys a little too small on my RIM 8700r.
Device convergence is cool. But given the demands I place on my devices, I need to talk on a phone and be able to type on my RIM at the same time. That means 2 separate devices for me.