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I'd say it could be a few things.
Battery really low as the alternator isn't charging
Alternator wire has broken off
Earth strap from the gearbox to chassis has snapped.
I've heard a few on car groups say that the AR-1 is better than the R888R in the dry.
Can only take that with a pinch of salt though until you try them yourself.
I believe the M3 Cup cars used the AR-1 this season too and are quicker. Not sure which tyre they used last season though.
Considering it's about £200 in labour to fit, £600 isn't bad for a rebuild depending what it needed.
Cheaper to get a 2nd hand one though like you say.
It may have a bit more assistance with pad compared to wheel, but it's far from easy i'd say.
I know what @Silent_Scone is saying about it looking like it's on rails too. Cars just seem to turn a lot sharper than they do when i use a wheel.