I can't speak from experience, but I really doubt you can "notice" cam gears. When going aftermarket their purpose is to allow adjustment. Also, in my case, and probably most cases cam gears come along with other mods and aren't a single upgrade so determining improvement based on feel would be really difficult. I wouldn't go in to a cam purchase looking to feel any difference what so ever. What you need them for is during the tuning process, you'll feel the improvements of a better running engine but not the gears themselves.
Correct me if I'm wrong...
-Towels