I have two and both function flawlessly. Both are a couple years old. The 6-18 on my .270 has seen a few hundred rounds, plenty of dialing up and down for long range, and a good knock on the floor and has never lost zero. The 3-12 on my .22 is a little clearer at max power than the 6-18. A buddy had a 3-9X for a few months until he picked it up one day and couldn't see through it. Cabela's refunded/credited him for it no problem.
AFAIC they're better than Tasco or Falcon, and for the money you can't go wrong. You might also want to consider one of the low end Vortex scopes like the Crossfire or Diamondback.