I just placed the order last night. But honestly, I'm curious to run them. A lot of people say they run great in their 3s Arrma's. Also, the ESC should go into thermal shutdown before sustaining internal damage. This is my first hobby grade RC, and I'm willing to take a chance and have something break. I'll be making a post when I get everything set up.C rating is all good, higher the better. But 8000 mah in a 3s truck is a bit much IMO. First is the extra weight but not a really big thing, you would get real good runtime. But second, at the same time may run into heat issues before you deplete that big lipo especially if it's hot outside.
I would suggest getting two 5400 mah lipos instead, you could run one to LVC, let the truck cool down a bit and run the second. Zeee makes 5400 3s packs and could save a few bucks there.