I bought my sp3 when it first come out , since I work offshore and was fed up carrying a big laptop all over the place with me . sp3 has done everything I could ask it to , I will keep this till it no longer works so won't be upgrading for another few cycles yet
I would recommend buying a SP I used and getting used to the tablet system and wait until the SP4 and then wait awhile longer to get feedback on the quality ... because SP 2 and 3 have had complaints about their quality and durability.
I've dropped my SP I 2 1/2 times and it landed flat on it's face but still works fine. Later version don't survive such treatment. You have to even be careful how you pick them up. If you pick them up by the top in the middle you risk cracking the screen but I've been doing that to my SPI for two years with no problem.
The 1/2 time I dropped it, I fell asleep with it on my lap and something startled me awake and it started falling to the floor but I grabbed it before it hit the floor with one hand. But I put a LOT of pressure on the screen with my thumb and the screen started flashing --- increasing and decreasing it's brightness and I thought I had ruined it -- but after a bit it straightened out and has been fine ever since.
I'm pretty sure that would have finished a SP3 or 4.
I'm looking forward myself to the SP4 -- IF -- it proves hardier and more reliable. I'm going to give my owner the SPI and buy a dock for it ( if I can find one ) to replace the 2007 laptop I have her using -- god is that thing slow, and I get the SP4. All she does is play games anyway. Doesn't need a lot of firepower. Once in awhile she googles stuff.
Love my SP I and hope the SP 4 turns out to be something special and worth waiting for.