I tested DEX.fo
The design:The website design is unique and very comfortable to the site. The swapping process is also simple without complications. Just select the pair you want to swap, choose the amount and the expect payment and receiving amount will be displayed.
I commend the design of “Use min and Use max”. This enabled me to simply click “use min” because is for testing purpose. I didn’t have to worry to send a little bit above the min deposit as other exchanges request, since the system had to set everything by itself. +1
The swaping:I chose my preferred pair (BTC to USDTtrc). I provided the destination address as well as the refund address. And initiated the swap.
I was given an address to deposit and I did and started writing this review waiting for the confirmation and completion of swap.
Timing and fee:The network confirmed my deposit in 13mins with a few of $0.21, after another 15mins the swapped coin hit my wallet. I sent $29.97 worth of btc and received 27.95 usdt, that should be about $2.02 fee excluding the network fee which was very low. I think this is fair.
Support: I had no reason to contact support, but I wanted to test their activeness but discovered I can contact live via simplex or send a mail. So, I didn’t bother since everything went smooth.
Some Observations:Does the image below represent the exchange reserve? If yes, the value changes every time the system refreshes. Reserves are supposed to be stable unless depleted by users

Secondly, the BTC to USD rate changes as you switch from one pair to another. As at the time I swapped, bitcoin price was 74,160 but it was showing $69,205 on the exchange.
Overall experience:It was a nice experience swapping here, I am likely going to be swapping here if the projects remains true.
I rate it 8.5/10