I am in the process of researching HD replacements for my 250Gb in my 13" uMBP as I would like to have more room for stuff. After searching threads here about replacements, it seems some people are having stalling and beachball issues with their replacement HDs in their uMBPs. So here is my poll: 1. Have you replaced the HD in a uMBP (with motion sensor) with no ill effects? 2. If so, what brand and size HD? and.... 3. What model uMBP TIA!