No I haven't, but I'd rather not pay for something if I can get something just as good (or better) for free.
Photopost looks very similar to coppermine which (IIRC) will integrate with YABBSE quite nicely.
Gallery on the other hand is good because you don't need any sort of databases, yet is still just as fast as coppermine.
Ok, I've just had a look at the photopost features and apart from the fact that gallery doesn't do eCards, nor is it db driven (which is not a bad thing), does not integrate with any forums (but it will work as a phpnuke or postnuke module, so the users can come from there), then they share all the same features.
Oh, yeah and the saving of $129 is also very nice 🙂