I think my biggest peeve with Jegs is when I placing an online order. Placing Summit orders online, you always have the option of picking it up at the store. Not so much with Jegs.
Anyway. Summit is awesome. I ordered a couple tires early this year or late last year. They pulled them by the tag on the tire, and one was mislabeled. I called them on a Saturday, the replacement tire was there by Tuesday and the UPS guy picked up the wrong one on Monday, I believe. Smooth and painless.