You do, but few OEMs use the same chargers as consistently across their line as Apple does. The only example I can think of where the same adapter is nearly always used is Dell - and actually, their PA-* series gets pretty consistently low ratings.
Ok that does seem to be the trend at Dell.
So any ideas what the best make is? I tried to find a chart but most reviews I cam accross weren't looking at longevity. Is there any 3rd party that makes proper JCB style "bombproof" adapters? I would be very interested in that especiallly if i they make 3rd party Magsafe ones as I 'd spend more for that rather than £65 over and over.