Never any problems with my Mini30. Despite the naysayers, mine is a 581 series with the heavier profile barrel and is about a 1.25 MOA gun with a 2-7X scope off the bench. I'm not the best bench rest shooter.
More clout than a 5.56, particularly in terms of barrier penetration. Mine clocks 2475fps with 123gr Fiocchi FMJs for 1673 ft lbs, far more than a .223/5.56mm AR.
Another advantage over ARs is the time to clean one. If you clean everything on a direct impingement AR it's time consuming, probably 25 min to strip it, take the bolt out and apart, clean that and the inside of the receiver, clean the barrel extension lugs and that's if the firing pin retaining pin likes you and goes in promptly.
Mini30 is 5 min with a Boresnake. Mine has been very reliable and the stock trigger is better than the stock MILSPEC AR trigger. I had an AR with a Timney trigger which was better than the Mini but that was close to $200 extra.
Get one! Don