I've been using my P1's with the ADV Sound Model 3 Bluetooth receiver. Really enjoying the combination so far. At the current drop pricing it's hard to do much better on an IEM for the money.
MeratorNo comparison -- the P1 is miles better in terms of sound quality and build quality (maybe with the exception of the cables). For a $75 wireless IEM the ADV Model 3 sounds good, but I think the bulk of what you are paying for with the Model 3 is the Bluetooth receiver and not the IEMs themselves.
needhelpSound quality wise -- I've been really pleasantly surprised with the power the ADV Sound adapter provides. It seems to drive the P1's much more easily than my Galaxy S8+.