The only problems I ever had with aces(I've only ever skated the AF1, so I can't speak on the classics) are:
The top washer would absolutely eat up my top bushings, and I swapped them for bones flat washers.
The fancy re-threader axle nuts don't stay tight, and I think they might ruin your axle threading after a while actually, so I swapped them for normal axle nuts. I own and use the separate re-threader if I need it.
They should come with three washers per wheel. I had to add a washer to the inside. The extra axle length is probably a feature, not a bug, but they should include the extra washer per wheel imo. Maybe it works better with the stock axle nuts, or super wide wheels, but I hate having the axle stick out a bunch past the nut... And I like some rattle too, I don't crank my wheels down all the way, or use spacers or anything like that.
Once I sawed off 1/16" from each end of the axles so I could run an old pair of AF1 55's on an 8" deck, with no washer inside and one washer outside. That was my peak madness.
Other than that I really enjoyed them. I switched to the hard bushings and ran them nut flush/little bit of thread coming out, just enough to feel secure, and they still turned just as great, but were a lot more stable on center and felt more poppy/energetic
Recently switched back to indys and just left them how they came cause I just don't care anymore. They don't turn as deep as aces. They're stable, but a little less lively/snappy. It's comfortable and familiar. Aces are badass, I just wish you could just slap em on your board and go, without having to tinker and sink more time and money into it.