Stick with the QT 4000, Do you really feel the need to waste a hundred+ bucks on a rest that will do absolutly nothing better than the one you have? IMO the QT 4000 is a much better designed, more reliable, and a better quality rest than the drop zone.

There have been reports of the string coming loose from the inside of the drop zone. IMO the string is just as effective as the steel cable. Just not on this particular rest.