I've had a couple failures to eject on the last round and found that it is very mag dependent.. my 25rd Glock that's pinned to 10rds almost never jams but the 10 round one usually jams on the 4th round. I also think it depends on whether or not you put pressure on the magazine as for one of the ASRs my friend had unless you hold the mag a little it would have a FTE but mine prefers to have no pressure on it.
It can be found cheaper than most other ones I've seen posted here, and the portability of it makes it fun/versatile as opposed to having to carry the big rifle case, etc just for plinking around..
I wonder if there the ASRs are more prone to FTEs in certain calibers? Since they are sold in 9mm/40s&w or the 10mm/45acp combo..