The transaction fee of bitcoin is quite expensive. why don't you exchange your coin to lower price like xlm to trx, etc. the fees relative cheap.
no extra fee? they are lie? not really!
like @DarkDays said, we need to check the
Expected rate.

on screenshot above, the price for 1 xlm = 0.000005 btc, that actually the current price 1 xlm = 0.00000780 btc. why the price is less than current price on market? because this is include exchange and transaction fee. that why they say no extra fees.
.... Has anybody successfully receive their funds from this platform?
sometime i use this platform for exchange small amount of my coin. till now i don't have any problem with this platform.
one of my interesting what they offer is, we will get free NOW token every we successful made transaction.