I have a Panamax, although it is of the front focus variety. Optically, it appears to me to be better than than Hawke in the glass sense but not quite on a par from a fit and finish point of view.

Side focus wise I have a 6-24 Diamond LR which I really rate, it sits atop my .22lr and I use it for bench rest. Only at the extremes of its magnification, say beyond 20mag, does it seem to run out of steam but other then that I think it is a good alternative to the Airmax optically . It is somewhat cheaper, mechanically just as good, does not have the big knobs, easier to reset the turrets, and you get a spare turret & a 2" sunshade too.