the aps main problem is the slightly positive buoyancy....other than that its a perfectly fine travel fin...
You find them a little positive? I have the black ones and I think they are just about dead neutral, if anything they feel very slightly negative. Of course, my legs are negative, so I may not be as sensitive to that as divers who need ankle weights.
I use mine for everything now, including with doubles and technical dives.
Not to hijack this thread, because sling-shots are excellent fins, too, but here is a review of the APS Mantaray fins I wrote:AtomicPirate WE COME FOR THE BOOTY
Jeff