E1 is a US rebranding company. The OEM I believe is JG or CYMA (some people have said E1 does a second QC check once the guns hit stateside plus some other "value added" stuff but I can't guarantee that's what they do). As for the quality, it's a good first foray into airsoft, the other brands you could pick just thinking off the top of my head include JG, CYMA, King Arms. IMO King Arms is one of the better ones to go with but TBH at that price point you're pretty much just getting the same thing under a different name brand (ie. there's almost no difference between say like a Corolla or Civic or Fiesta or Neon or Cavalier or whatever different brandnames, slightly different specs, generally in the same price bracket, etc.).
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE