Just looking at buying either a new 15" MBP or a 13" air. A couple of things are attractive to me compared to my 2008 MBP - battery life (I'm at about 2.5 hrs now) and responsiveness due to SSD. on the Air the longer standby is good too as my usage can be patchy. For the MBP 15", is it better to get the apple SSD as an upgrade when I buy it (£150 cost for the 128GB), or is it better value to do it later on? Just a little wary about talk of TRIM etc and 3rd party SSD support. Plus its an upgrade I'd want to do sooner rather than later, to avoid the need to reinstall when changing drives - unlike RAM which I can do later on. £150 doesn't sound too bad for a 128GB SSD.