I would highly recommend the Quiver Critter. I have had very good success with it. As mentioned the stake that comes with it would be nearly impossible to push into frozen ground. I recieved mine as a gift, and did a search on here about them before I took it out. I took a wood dowel rod the same diameter as the stake and about 3" long, and drilled a hole about half way through it and glued a gutter spike into it. I painted the gutter spike blood red, since it's not all completely in the ground. The base that would normally sit on the stake now sits on the dowel rod. I haven't had any problems at all pushing it into frozen ground! I use rechargable batteries, and they will last a very long time. Also some guys complain about a "clunking" sound as it quivers. I haven't had this problem with mine, but have read that a piece of electrical tape around the bolt that inserts into the cup part of the base will cure the problem.
All in all I give it an A-.
