Service announcement: eXch Android app is there!
New app looks very good, but I think eXch should also work fine if used with Tor mobile browser.
Is there some shortage of xmr at the moment?
Have you confirmed that the fee rate is variable between 0.5% and 1%? There is no fee rate info on the website and I'm trying to collect this data.
From my own testing and usage I can say that Dynamic rate is much better, not only because of percentage, but in cases where transaction fees are higher and exchange happens later than usual.