I own two Acers: a laptop, Travelmate 2210, and a netbook, Aspire One ZG5.
The laptop is easier to disassemble and access all components, pretty much the same as the picture in a previous post
The AAO is bordering on a nightmare to disassemble and access components but can be done with care, (I've done it 3 times for modding).
Even though the laptop suffered a malfunction just after I bought it, it was repaired and hasn't had a problem since - I've changed the CPU in it, (shows you how old it is - 2005), and upgraded the HDD.
I'd still buy an Acer today because the reasons I bought it are still valid today: price and more importantly, (for me), a real International Warranty.