I've ordered front rockauto once, and got all the right parts for my square body Chevy. But like Nate said the get you on shipping, you can be extra careful about getting parts from the same shipping location but soon as you get x number of parts one or 2 suddenly ship out of a different location. It's what's stopped my from using them for years, I paid $80 in shipping on my last order was 3 "different" shipping locations in 3 different mostly empty boxs with air packets in them and all shipped from the same city same address.......seems like a waste of packing material for nothing plus the extra coin i had to spend.
But end of the day I still cut the parts bill in half easily as opposed to buying local. Just watch you cart closely is what I learnt. I will order from them again tho, I just hope I don't get any used parts haha.

I've probably had fifty flawless orders with Rockauto. I recommend 'em to everybody. I've probably saved enough on DSM parts on there to buy another DSM. All three I've owned had factory suspension, steering gear, yada yada that needed gone through. I like paying $11 on closeout for a control arm that rings up $60 at the parts stores.

They did send me an almost identical but functionally completely useless oil pan for my Audi once, but usually they're pretty freaking awesome.

Ngk plug wires $24.88