Has anyone used gambling devices? I just found a website that sells machines to cheat at a casino.?

Don't waste your money. Any gambling devices you take into a casino are either going to be illegal or they will get you thrown out. The casinos are very fussy about people using gambling aids and they will not hesitate to give you the boot. Card counting works fairly well when you are playing with a single deck but when the house uses multiple decks it becomes exceedingly difficult to remember all of the cards that have been played. You will have a lot more fun if you just think of gambling as entertainment, set a limit on how much you are willing to lose and stop playing when you reach your limit.