If you mean the Galco Skyops I have one for the Sig P239 and also the Glock 19. The Skyops is more of a "pouch" than a form-fitted holster, and relies on the pressure from being held tightly against the body (IWB) to secure the pistol. While I like mine since it is the most "concealable" holster I own, there are two drawbacks:
1) Grip on mine seems to ride on top the belt, making a good combat grip when drawing difficult.
2) Re-holstering is difficult if not impossible for me without undoing the pants.
You can always ask the shop if they will take it back, as long as there are no signs of wear they should.