I don’t personally own one but they look pretty solid. I could see the potential for maybe missing one of the brush stoppers or possibly tweaking one of the “crows” feet that compresses the spring out of squares, but I would imagine even that is pretty unlikely.
I know a handful of the guys on here either own one or have rented it, I’m sure you’ll get some good feedback.
As an alternative to the AGA tool and saves you a few bucks:
https://supershop.store/products/bmw...CABEgLu-fD_BwE
NOTE - I have not used either tool yet so I can’t say one over the other, but they do the same job.