Gliptone is a company based out of NY. They are popular here in the North East. Their entire consumer line is found locally in my Pep Boys.
I have used their Pro Buff Cleaner Wax which is my favorite one step cleaner wax because it contains slight abrasives for swirl and light defect removal.
Anthony Orosco has used some of their professional stuff.
Porsche topped w/ Gliptone paste:
http://autopia.org/forum/showthread.php?t=55842&highlight=gliptone
Corvette with Gliptone products:
http://autopia.org/forum/showthread.php?t=54716&highlight=gliptone
Engine detail with Pro Buff
http://autopia.org/forum/showthread.php?t=40249&highlight=gliptone
Anthony Orosco discussing Gliptone:
http://autopia.org/forum/showthread.php?t=54031&highlight=gliptone
In my experience with their prodcuts (which includes others besides the Pro buff in their consumer line) is that they are not bad. They aren't better than say Meguiar's, but rather, a solid product line that delivers nice results. It'll get the job done, but it hasn't really delivered the "holy cow" factor if you know what I mean for *me.* I have had Gliptone wax look great, but as you know, it was the result of the prep!
I wouldn't be overly enthusiastic about them, but don't shut them out either. Ask your representative to let you try some small samples of various prodcuts to see if you like them enough to include in your inventory. You may find a product or two (APC, tire dressing, leather cleaner, polish, etc...) that is cost effective and delivers results to your expectations.
Hope this helps James!