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I had a BB 9105 Pearl and then got myself the Z10 as the Pearl was feeling it's age and I've not looked back since! The Z10 is really easy to use and quick. Typing with the Z10 is amazing - all my friends actually like how you can flick words up and string full sentences with real words rather than some alpha-numberic coded gibberish at great pace.
One of the reasons I went away from the physical button phone, apart from the larger display, is that I preferred the old-school candybar phone button layout - I can't handle those tiny but full keyboard button layouts! Friends who have them vouch for them but just not for me! Hope BB do well though cos I really think there new range is good.