I know that forums only tell you about reliability issues, but is there much of a perception of problems yet? I'm reading of bluetooth issues etc.
I have the i5 / 256GB SP3 and docking station and they've been great. I've heard about some folks having WiFi issues but thankfully mine has been great. I also understand that the i7 doesn't get the battery life of the i5, which is to be expected. Under normal use I get around 8 hrs with mine, but when I'm in Lightroom and Photoshop a lot it really chews up the battery much faster.