I bought a Darkglass The Exponent 500 and decided (after consulting with Thomann) that this was the best alternative to control it and I haven't been disappointed.
It is simple to integrate and use with the app (PC, tablet, or phone. I've tried them all). Good quality and the cable is long enough (I think ~7m long?).
I only gave it 4 stars in the features because I think there are some things that could be improved with the less, but there are updates coming so maybe I will re evaluate my review in a few months.