Yes, I've had an Altaros booster a little over a year. Had a Shoebox F10 prior to that.
Xindaris was not a fan of his Altaros, but I've been quite pleased with mine. The difference in our opinions is probably because I'm perfectly happy to let it fill nice and slow.
I recently emptied one of my big air tanks, the intent was to do a visual and make sure it didn't have a bunch of water or corrosion. For background, I've owned this tank for 5-6years. It's only ever been filled with a booster, Shoebox for the first 4-5 years and the Altaros for the last 13-14 months. Upon inspection last week it was bone dry, and no sign of corrosion or even discoloration. The inside off the tank was shiny aluminum.
Boosters CAN work and work quite well, for the patient ones amongst us. Let em fill nice and slow and the air doesn't get hot. Cooler air makes it easier to separate the water vapor before it ever even gets to the booster. Get impatient and try to fill tanks fast with a booster and you've got hot, wet air, and the first stage shop compressor dies prematurely from being overworked and overheated.
(The above is not a claim that the Altaros Booster is "the best" but rather responding to danmans question if anybody had an Altaros booster).