Mallard Vortex, Merry Go Round

[Bonecrusher]

Several different makes & models on the market, I would appreciate any feed back on the results any individuals have had with them? Do they do the job or is there better alternatives on the market.

http://i66.photobucket.com/albums/h258/HossNZ/Hunting/Kaituna.jpg

http://i66.photobucket.com/albums/h258/HossNZ/Hunting/Kereru.jpg