I have a spray tan booth. It's not mystic tan but the dual spray booth from sunquest. I use the booth myself as i do the spray tans and have no-one to spray me:cry:.
Given the choice i would have a manual spray tan every time.
You get sprayed from nozzles in the booth and it collects all round the booth and then drops over you. It misses bits everywhere! First couple of times i used it i had splotches everwhere and runs from where i had stood too close to the nozzles. I've get a decentish tan now as i make sure i stand as far from the nozzles as i can. Make sure you put vaseline over your fingernails, toenails, palms, toes and side of feet as i've found that that's where it goes on too much. I always use a glove immediately after coming out of the booth. It tends to miss patches on your arms quite bad so i get the glove and rub myself all over while it is still wet.
I have a full length mirror so i have a good look and quickly wipe everywhere with the glove.
My last couple of tans have come out ok but i have had to go on it twice one after the other to get enough liquid out to spread about.
It will last as long as a manual spray. I charge £10 but to be honest most people have the manual spray and the booth is not very popular at all.
My booth only has one pot so that means only one colour and one percentage. I have 10% solution in mine so if someone came in and wanted 8% or 12% then they can't.
I'm not sure what the mystic tan booth does but i'd ask lots of questions first.