I have an older one that is, from what I read, accurate for its vintage. I have also read stuff like what dieseldog said about weight on the end of the barrel helping with accuracy. Mine came with a flash suppressor, I shot groups with it, then removed the suppressor and it grouped the same. I’m sure each rifle is different.
As a platform I absolutely love mini’s, I blame the 10/22 I bought at 12 years old for ruining me for rifle size. I really like compact rifles, anything over 40” long is dead to me, anything under 38” is even better, mini’s fit the bill. Mine is deadly reliable and accurate enough for what I use it for.
Another difference between the older and newer ones is it is much easier to conventionally (over the receiver) mount a scope on the newer ones, options on the older ones are fairly limited.
As mentioned by others, the government thinks mini’s are evil, and they will almost definitely be banned when the hammer comes down.