This is one of two main places in Boise for glory hole action, the other being Over 19 Adult Shop in Garden City.
Vixen has a large area with about a dozen video booths of various size. Most have glory holes; some have one on either side. Admission to the store (which also has a large selection of videos, magazines, and toys) is free, but of course you have to put money into the video player in the booth or they will roust you. I don't usually see a big crowd of patrons there, but usually 3-4 at least. I agree with other commenters, the staff is friendly.
My only complaints about Vixen are that some of the best booths have been out of order for months; too much of the booth area is very brightly lit; and the parking situation is such that it's difficult to enter and leave the store anonymously,