I did a test exchange using #StealthEX, converting some BTC to XMR. Apart from the fact that the #bitcoin portion of the exchange (where I sent BTC to the address provided) took 20 hours, the exchange went through smoothly and I ended up with the correct amount of XMR in my #Monero wallet.
The bitcoin confirmation took so long because it was a 5 sat/vB transaction. I think that's the standard set by the StealthEX app. I watched as my transaction kept getting bumped to later and later blocks until it finally crossed the finish line. Once that happened, the exchange was pretty much instantaneous. Next time, I'm going to try to increase the fee so it doesn't take literally all day.
Ultimately, StealthEX lived up to their promise, and I'll be using them again in the future.