As far as I heard,all available arbitrage bots are still complex to use and in their infancy.They are okay for highly experienced trader but not for beginners.You have to learn to use them properly before going on board.
This is not necessarily true, many are no longer in their infancy.
I do agree that anybody considering using a bot to trade for them should learn how to properly use it, back test it, and fully understand what it does prior to putting any real money behind it - or better yet hire someone who does know what they are doing.