I have been using
http://Cryptotrader.org for a couple of months now, and it is not a scam. But you will have to be realistic. You will not get rich overnight. Don't be fooled by bots that make millions, it's not possible. But bots can protect your money and make some profit but there are always risks involved.
All that a bot will do that trades in that fashion is follow a preset of rules that you or someone else give it.
Your success will depend on how accurate your rules are at predicting where the price will go before the rules say to take another trade