I personally wouldn't buy any pre made kits. You can source most of the basic tools from Canadian tire or princess auto at a much cheaper price and they work every bit as good. I've built 7 rifles and I've never had issues.
Only thing I always recommend, avoid the magpul Bev blocks. I know a lot of guys swear by them, but I had a gunsmith spin off a barrel but for me using one and slightly warped the upper receiver around the ejection port. I strongly advise spending the money on a geissele reaction rod >> torque is entirely and only applied to the barrel extension and eliminates any possibilities of problems.