Anyone using it? Is it worth the $20.00? Just picked up an assualt and will be hunting with it this weekend. Have used an old Summit Viper up until now that I modified for dip style hand climbing. Not really sure how I feel about putting my elbows and chest on the seat and doing crunches. I do enough of those at the gym and doesn't it take like 100 to get up the tree? Also, anyone make their own with two carabiners and some type of strap? If so what kind of strap did you use and what length works well.