I am also a committed Mac fan, but will mention some of the potential disadvantages:

1. MacBooks are more expensive than PC laptops, though the gap narrows significantly if you compare with a PC laptop with all the same features (see the Which? report).

2. I highly recommend getting a 2 year extended warranty: all my PowerBooks and MacBooks have needed repair valued at more than the cost of a warranty, probably because I treat them roughly and they travel everywhere with me. (Being a cheapskate, I have found you can buy the extended warranty half price on US eBay!). Apple Store repairs are much faster than authorised repairers.

3. The current version of Microsoft Office for Mac does not support macros (they are promised for the next release). You either need to run the previous version of Office (easy if it is still installed), or use Office for Windows.