Well since you want first hand, the thing I can tell you first hand is when you compare similar features, their bargain basement price fades rapidly. Digest the primer sticky then look at PSA and you'll understand.
Also use the search function for more info on Model 1, if you have the time.
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