For only being about a ten minute drive from downtown Riverside, this place seems to have a different atmosphere than similar stores downtown. Its product lines are a little more "cute" (being more about fuzzy bunnies than kitsch), though they have a hefty selection of embossing powders and other accessories, which makes up for the cuteness in a hurry.
The prices were quite reasonable. Stamps that list for $12/ea are roughly 15-20% cheaper, and papers here are much less expensive than at some of the other places in town.
Where SG has a problem, though, is in selection (on the paper front). Glossy cardstock seems to be the lot of it, with a basket or two of large sheets of handmade papers in the front. As a paper addict, I was a little disappointed in this.
The classes here are fabulous though. They routinely get very large names in the stamping community to come out and teach classes that aren't traditional stamping classes. Things like making your own 3-D shrines, binding books, and creating tiles out of plastic -- off the wall stuff that would really appeal to the more out-of-genre artists.