it is worth it to buy this bot?
Obviously, considering the number of satisfied users, the answer is yes.
I have to start to read many pages then... i have to study this bot how it works..
it works for all three exchanges or i need to buy one for each?
You buy the bot with one exchange, which is 0.1 BTC. Any other license costs 0.05 BTC. So if you want to have all 3 exchanges, you have to pay 0.2 BTC. Then were are a few guys who are able to give you a ref code, like 10%. That means you pay 1.8BTC for bot and all exchanges.