I've had one for my AP 24 for about 6 weeks (I think). It fits right in the chamber, and it started pulling junk on the first day. It took about 2 weeks for the micro bubbles to dissipate, but others have had it gone in a few days.
If you're keeping the pc hood, it's the only option out there, which is OK, as it works. If you're running hood-less, you have more choices such as a HOB Remora or the CSS 65 as well as the Tunze DOC 9002.