I bought one and mounted it on 1.5kw Chinese spindle. It's not plug and play, and the documentation is sparse. The unit feels very well constructed and precise, but it has some critical gotchas.
First off, you have to get your spindle taken apart at the top, just to access the pin spanner holes at the top of the shaft. Without that, there is no way to immobilize the spindle to thread the changer on -- and nobody tells you this before you buy it. The Chinese spindles have no spindle lock built-in like the Kress routers that the ATC was originally designed for so they require surgery. With water-cooled spindles, extra care needs to be taken when reassembling the top portion, as that is where the water/electrical barrier is crucial. There are two tiny o-rings counterbored into one side of the mating faces, and they are covered with a slopass dollop of some kind of sealant. In my case, one remained glued to each of the separated faces, and I didn't even notice them the first time I took it apart and reassembled it -- I got lucky, because on subsequent teardowns, one o-ring popped out and rolled across the bench.
The second gotcha - a probable design flaw in the ATC unit. There is a cylindrical collar that screws over the tapered shaft that mates to the Chinese spindle. That collar is about 30 mm in diameter, and is held in place (at 24000 rpm) by about 3 threads, engaging the bearing preloader beneath it only about 2mm. During my first attempted cut, the collar separated from the preloader and that caused the top and bottom air seals to self-destruct. The manufacturer seems to not believe this, and tried to convince me it was my fault for ejecting the tool while spinning...but that did not happen. My theory is that aggressive spindle braking worked the collar loose and exposed its insufficient thread engagement flaw.
The replacement seal kit is about $10 and the shipping is 20 -- for a 40mm x 1mm and a 30mm x 1mm silicone washer. I sourced some 1mm silicone sheet and machined a set of punch dies to cut my own seals -- since I don't believe these seals can last very long as designed. The top seal, in particular, is subject to constant friction, as its inner diameter rides in a groove machined into the spinning collar while its outer diameter is held down by a pinch plate and o-ring. The collar is now held in place with a fair application of Loctite, and we'll see how it holds up. So far, so good in dry runs...not cutting.
I've actually made some modifications to the Chinese spindle to mimic a spindle lock, so now I can install and remove the ATC without giving the spindle another lobotomy. I'll make some test cuts later this week and share anything that is interesting.