Glacern tool quality is awesome. Even if they use the same forgings, I would bet on Glacern's Quality Control--the owner is a real stickler.
As for Maritool, they're another great vendor. Mactec, I don't know what you think you heard, where and when, but I've never seen Frank Mari make any such claims. His tooling is great too, but I mostly buy endmills from him.
Nothing wrong with Shars either. I've bought a lot of things from them, and they can be a cut above the usual import stuff. However, Glacern and Maritool are both a further cut above in my experience.
Cheers,
BW
Try G-Wizard Machinist's Calculator for free:
http://www.cnccookbook.com/CCGWizard.html