Now I'm used to it I'm liking it. Still has a few annoying quirks that piss me off, but it's a good smartphone none the less. I'd still struggle to pick a clear winner between the iP4 and a (good) BB as they both do certain things better, but I think from an ease of use point of view the iP4 kills BB...sadly it can also be the iP4's downfall as at times it's so f**king restricted it takes the piss.
Battery life of the 4 is unreal though. I hammer it all day doing some quite intensive things, from about 5:30, and it's still going strong at gone 23:00 on the same charge. It's a freak, my BB would need a charge at lunch under the same circumstances.
Ironically I lost all data just as I was about to hit send and had to power cycle my 4 to get it back, after 30 minutes.