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BTS DEX is definitely interesting, I have yet to mess around with it though.

Yes I have used it a few times. It needs some polish in terms of UI to appeal to the masses I think.

Crypto still has a long way to go in regards to usability and UI

I would at a minimum not keep all eggs in one basket. I've been using Bittrex for a while now. I find it to be much more difficult in its layout and how you execute orders. Overall, I agree that it is frustrating to not be able to execute when desired.

I use Bittrex, the layout isn't the best, but I have never encountered any problems

Yes always keep things spread out.