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Of the three exchanges you mentioned earlier, only Qtrade has a very small fee, and its interface is easy to use. but the time it takes for deposit is too long to wait. Idena prices on Qtrade are sometimes higher than others, and in Qtrade are free trading bots.
I like qtrade very much, especially as 80% of iden trading takes place on this exchange. But I don't agree that they have the lowest fees - especially when it comes to trading. A taker trading Idena pays as much as 1.5%, which compared to 0.2% on Hotbit or 0.2% on probit is a very high fee.