I've had a Magna with zytel scales for some time now. Cost me $38+, shipping included, from Bayou Laforche.
Setup was perfect. Liner-lock perfectly registered and I can't force an unintentional lock failure by either twisting or spine-whacking. Actually, due to the thick steel liners, it would take a gorilla to twist this knife along the blade/handle axis.
The blade-opening studs are cupped and stand off from the blade a bit to compensate for the overall width of this knife. This makes opening quite fast and easy with no discomfort to the thumb at all. I did notice some discomfort due to the stud stand-off after several hours when the knife is carried in-waistband. As a comparison, the feel of this knife carried IWB is about the same as the CRKT Point Guard, since both have thick metal liners.
The blade material is AUS8, which is an excellent steel for a knife that costs less than $40, including shipping.
In terms of value, I think the Magna is the current champion. In terms of quality workmanship as-delivered, my Magna is comparable to $100 price-class folders by Benchmade or Spyderco.
I don't think you'll be disappointed with this knife.