I've thrown both JLS and OLS, and had my good and bad throws with both, but never tried the Qs. Millenium is a pretty cool company that a bunch of old DGers started with the goal of making discs that are consistent out of the box. All the plastic is done by Innova, but the baseline definitely is tougher than Pro and DX.
Millenium definitely went in a cool direction.. Names that describe the disc, good baseline plastic, out of the box consistency, and some basic but good discs.