I do. In fact I have 3 of them, 1 fp and 2 fp-L. I love them, as one would guess but they're not everyone's idea of a good camera. No viewfinder makes it awkward for manual focus since you can't hold it against your eye (you can add the auxiliary evf but that just makes it bigger than most any mirrorless), no physical shutter means you have to use slow speeds in most artificial light, few dedicated dials means getting used to menus, button pushing and knob twirling.
On the plus side it's tiny, has huge resolution in the fp-L, quite quick in operation, has great choice of L-mount lenses. I have all the I Series Sigma lenses and they are all terrific. Their big selling point is compactness and image and build quality, which they are and have, but I have to say they could stand to be even smaller.
There are almost no positive reviews of these cameras, which personally I view as a point of honour. As a user I think they're the best thing in a long while, if you accept their shortcomings/differences.