I haven't used them. I looked at their pricing.... looks like it could save a few dollars here and there, but overall pretty comparable. Looked to be about $10 cheaper shipped than where I would usually buy. With sideart... I don't worry too much about durability since it doesn't get roughed up much in a home setting.
I won't scrimp on control panels though.. I would rather pay higher costs and get good quality. I wonder if there's an extra charge for extra die-cuts on the large decals? If not, then that would be about an extra $20 in savings.