As far as spare parts go, that is no reason not to get one.
The only thing I have ever seen go wrong on an ROA is the base pin being bent due to being dumb and not tightening the retaining lock.
I have seen many bent base pins. I have never seen one not able to be straightened out and work perfectly.
If an ROA could be broke with normal use and abuse, trust me, I would have done it.
An ACCURATE load on an ROA is somewhere between 23-28gr of 3f depending on the gun. Filler will tighten a group up slightly. When I say slightly, roughly 1/8-1/4 inch at 25yds.