Got on fine with this seat until potty training my son when the seat was around 2-3 years old. Took the cover off to wash it and discovered the part of the seat belt harness down the back of the seat (i.e. the section that is completely hidden in normal use) was badly frayed. This was fairly scary since these are what hold your child in the seat in the event of an accident.
Even worse was the response from the manufacturers (Dorel UK) who we contacted as soon as we discovered this potentially life-threatening damage. Despite the fact that the seat was no more than a few months out of its two year warranty, they insisted that we courier the seat to their service centre in Norwich (at our expense) and then pay them £50 to look at the seat, a process which we were told could take up to four weeks. Obviously, during this time we would be without a car seat; no car journeys for us for a month.
So by all means buy one, but keep an eye on the straps (under the cover, down the back of the seat), be prepared to spend up to £80 getting it fixed, and don't expect anything approaching decent customer service from the manufacturer should something go wrong.