I used them once, for a clutch replacement and to find a knocking fault nearside front.
They replaced the clutch, and charged me for a replacement flywheel (said mine was unserviceable).
Charged me £10 to replace an exhast nut and bolt that they said was seized.
Couldn't find the fault (which happened to be a loose nut on the suspension top plate, and which Deano666 found within 1 minute)
Quoted me around £450.00, bill came to over £650.00. Flywheel, nut & bolt, additional labour etc....