We've had our MOT Computer running for a couple of weeks, now. It took a little getting used to, but we find it isn't all that bad.
DVLA database has a lot of errors in it, incorrect VINs, wrong engine sizes, etc. As a tester, we must register the details of the vehicle we are presented with. Some owners are going to get querying leters from the DVLA to confirm their vehicles details. Some may get a bill to repay car tax for the higher engine size...
A vehicle with a large amount of failure items takes a long time to enter into the computer. Each item must be individualy entered - ie not in a group as in '4 bald tyres' Corossion areas are a bit of a pain to type in.
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Vehicles remaining for repair cannot be charged for a retest. Vehicles failing on only specified minor items, and returned for retesting by end of next working day - no charge. All other vehicles must have a FULL RETEST, and I don't think there will be many garages not charging the full fee for this retest.