You have a good point about the 2 year guarantee
But I had a lot of hassle getting my machine (G4 dual 1.4) from them in the end... they were constantly getting stock levels/delivery dates wrong, and in the end I felt I had to go up to Watford to pick the bloody thing up as they wanted a week to get the machine from Watford to London.
Sooo... if you want to go with JL, then ensure they actually have the machines in stock first.