So I have a 2008 AluBook (is that still what we call them?) with 2.4GHz Intel C2D & 4GB RAM. I went into an Apple store today because I'm looking to buy a 13" MBA in the next few months (or maybe a rMBP 13" if it appears). In a nutshell, the guy told me I would see comparable speed from my current laptop if I: - put 8GB RAM in - swapped out the HD for an SSD - replaced the battery Now I nodded along, but I'm not convinced at all that mine would match or even beat a brand new 13" MBA with 8GB RAM. Is he right? It would certainly be cheaper. Although I do really want a MBA for the size etc.