Hi Vinny we ours three years now, or four, i lose track.
When we got it of course we went mental and covered a whole wall in fancy mounts. (mats). almost none of which we have ever been asked for, but plenty of customers going "coo" and "wow".
most of our mounts for the shop (mats) are rectangular. less than 0.5 percent oval.
I dont know how this translates to over the pond shoppers, but we cant hardly sell a v-groove. Maybe they are a bit conservative in Cornwall. lol.
Best advice i've got is dont over-do it! Or make a load of 12x10 mounts and put them in a ring-binder at the counter for customers to browse. .... Ovals, hearts, double mats, etc.
Have to very much agree that one thing that does sell well are photomats in photo2 font, a couple on display with photos in does the trick.
And a couple of arrays for cigarette cards, collectors cards etc.
Plenty on the wizard users forum, at wiz-int.
ps. love couture gallery's idea of using the ceiling space! Nice one!