How about telling us what you see in them?
To be honest, I just skimmed over their stuff and was not impressed, certainly not enough to become their guinea pig. I'd go with something else. PSA is a great choice for quality parts on a budget.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek