I've been using the Dash for a few months and last week got a BB Pearl. I am much happier with the Pearl, though might have to switch to a BB with a full keyboard.

Pearl is much faster, easier to get into speakerphone, call clarity is better, battery lasts me 3x longer, camera as a flash, screen / keyboard lock works a little faster, turns from off in 3 seconds vs almost a minute on the dash.

I like the Dash for the WiFi, customizable themes, SlingPlayer, email client UI style.