What 1-6x are you interested in? They range from anywhere from $200 to over $2000. There is a huge difference.
I had a Meopta K-dot 1-4x for about 5 years which I recently replaced with a Vortex Razor HD Gen II 1-6x. I also have a MTAC 1-4x in my possession as well.
The MTAC while a good optic, is a few steps behind my Meopta, which is a few steps behind the Razor.
With all 3 scopes on 1x, the MTAC had the most fishbowl effect, about .1x more magnification, and narrowest FOV. I'm personally not a fan of the thick donut reticle for 500+ yards shooting on small targets.
Also, Primary Arms has a 15% off sale going on right now, you can get a killer deal.
Here's a review I posted between the Meopta and Razor.
Quoted:
Vortex Razor Gen II 1-6x24
It replaced my Meopta K-dot 1-4x22, which isn't a slouch by any means.
Pros:
Larger FOV
Larger Eyebox
More magnification (duh)
Low profile knobs, works fine w/ or w/o covers and easy to dial
Shorter (not an issue for me, but some people like shorter optics)
Cons:
Double the price
Heavier
No sunshade (the K-dot has a built in sunshade, which is why it's so long
Magnification ring is quite stiff
Large occular may limit some mounting options.
Similarities:
Outstanding glass
Daylight bright reticles (although I'll give the edge to the K-dot, due to the larger reticle)
Off position between each brightness setting
.5 MOA adjustments
SFP reticles
Notables:
I prefer the thinner JM-1 reticle on the Razor. Personal preference.
Razor eye relief is about an inch longer. You may need a different mount depending on current equipment
Vortex:
Meopta
View Quote