I must be super unlucky. I find their maintenance well below par. They're the only company that attempts to rent me cars/vans with: oil service lights, bald tires, cracked windscreens. This isn't limited to a single branch either.
Also £100 is not their standard excess, so you're paying for the reduced liability. (Also, they like to tell you every time in the hard sell that the £1,000 excess is for each and every incident and the full amount will be taken immediately... ?! Not sure how true that is)
However, they have the most branches in the UK of any rental company, so they're often extremely convenient.