i have never owned a sk2 and will never own one i have gone from the nextel bb7520 to the 7105t and i love bb's and will never look at anything else again......the bb7520 was a great device for me the battery life was ok last me usually a day or a day and half, the keyboard setup was great.....and the reliability of the programming on the bb's is outstanding.....now on my 7105t i have the suretype and whoever said it was meant for a a message here and there its not true......i type atleast 60 to 90 messages including long emails a day since i work for the air force base down here in homestead, florida.....the abttery on the 7105t is outstanding this one with heavy email pusshing, messaging in and out dowloading and opening documents i have battery 2 days after......the smaller size makes it easier to one hand type on it and it is quicker if you leanr the ins and outs to get the right words that would get mixed up with other words......and as for the screen i am able to see it in anytime of the day even outside with the bright sun down here in south florida....