I've been using this bot for one month. I bought it as goxbot and after mtgox went down he sent me xbot for bitstamp.
My own config is almost same than the default but ratio trend indicator is in more important role. Though it seems it's best to react to big movements like very long emas crossing - if we are only using these technical indocators.
Therefore the bot will be quite passive with good configuration... but it stays up all day and night. I made some profit with that drop from 670 to 620 (was sleeping) but since that it's been holding mostly.
Still waiting for bigger movement. It performed well in backtests.
All bots perform well in backtests, because it does not have any delay or bugs.
Anyway, it is useless to buy a bot.
If it is a good bot, noone will never sell it.
And if it is a bad bot, it is not a good idea to buy it.
There was some bugs when he released the first version supporting bitstamp, but now It's been working. Error log has some connection errors but those were caused by bitstamp updating their services or ddos.