You are on the high end hunt today with your posts in Acme and Glockenklang
First, 'pro's using them' etc. has little to do with anything. These type of products are small volume, low distribution products that have very low awareness among the general bass playing public. So, zero correlation IMO between 'seeing these brands in videos or concert stages' and 'quality or tone'.
That being said, the Acme's are among the most unique sounding cabs out there. Extremely low bass extension (which is why the original cabs were called 'Low B' cabs), which results in very low efficiency (i.e., not loud per watt, and given the voicing it takes quite a lot of drivers to get to the equivalent volume of more traditionally voiced cabs).
Nice stuff, but takes some knowledge to really make them work IMO (i.e., the balance between using enough power to get them wumping versus blowing them up is a fine line, and many feel that an external hi pass is needed to control that big low in in some contexts).
Andy Lewis (Acme) has recently come out with Neo 112 cabs that sound very nice and have that big low end in a more lightweight package, and also a bit more midrange response.
Nice boxes, but some homework is needed to make sure they will work for what you are trying to do.
I gigged a B210 stack for a while back in the day, and recently gave the Neo112Fullrange model a try. The trade-off in efficiency and 'punch' versus that big low end was not a positive one for me personally, so I gig other cabs at this point. Beautifully made and designed boxes though if the voicing and performance fits your goals.