Ken, I just see so many blown and damaged drivers in all makes that I don't think Acme stands out particularly. Especially if you consider that its users are after LF performance among other things, which many bass players forgo, knowingly or not. So there are some differences.
The biggest mistake I see is that people have expectations without experience, and don't know when to add cabs/drivers. It's actually trickier with the Acmes perhaps, because a dedicated midrange keeps a lot of midrange distortion from appearing when the woofer is near its limits.
A lot of users have learned the hard way after upping the average wattage to ridiculous levels that it's smarter to add more cabs/drivers becasue there's no way around Hoffman's Iron Law, or thermal buildup or excursion limits either.
As far as users of more conventional bass cabs, not many of them are going to do nearly as well once they actually try to get the same amount of sub-100 Hz content. You choose your poison ; }
+1... and your point about the dedicated midrange 'fooling' some into missing the signs of woofer problems is a good one.
Again, the positives to me about the Acme's is that, except for the discontinued EA VL line, there is nothing really like them on the market (i.e., deep, full, even, close to flat response) and a totally scalable voicing (i.e., the 210 sounds virtually identical to 2 x 110, etc.). I guess the Accugrooves have a three way design, but they don't achieve any sort of 'flat' response to me (e.g., the Tri112 sound VERY different from the Tri210, which sounds almost completely different from the Whappo, etc., etc.).
The trouble is, unique positives are also accompanied by some IMO unique negatives that I feel potential buyers should be aware of.
I do think some of the user error comes from trying to get these cabs to punch through a mix (a wide, even tone with deep bass extension can be hell in a mix with a bass drum pounding!). They sound great, and you just feel that if you can get them just a little louder by pumping more power into them, then everything will be OK, and then 'bam'!

