Well I agree with everything that's been posted here, esp. the weight. One advantage I always felt was that if some noxious mammal accosted me from the bushes out yonder, they'd not stand a chance against an Owl 7by bolero.
I have the grey/black version of the 7X45 NOs, along with 7X FL's also, and have had a chance to do some off the cuff A-Bing of the two. While the FL seems a little more neutral in tone compared to the Owls, which seem a tad warm (greenish?) to me, the NO's have more of the periphery of the field in focus at the same time as the center, where the FL's go soft about maybe 80% of the way out. I wear specs, and had problems with the blackout issue, but just tacked the winged portion of the eyecup down with superglue and that solved the issue, works like a champ. I obtained an extra pair of eyecups as a spare just in case I change my style of glasses, or maybe get to where I can actually see one of these days... (struck sighted?). The eyecups also cracked w/in a short time, as I recall, but not to the point where they actually fell apart. I can still obtain eyecups, strap and case over the net. Incidentally, the Owls had the neatest strap arrangement for 'nocs ever developed, IMHO, and why Zeiss didn't carry them over to later lines I'll never know.
Resolution wise, there is little to choose between the NO's and FL's; although the FL's do seem less plagued by the dreaded chromatic abberator (speaking of noxious mammals...?), the NO's are not too bad, but do show (at least in my pair) some (is it?) lateral CA on high contrast targets, but not dead center. The Owls have an absolutely huge A/T FOV, and a right nice depth of field I belived it's referred to, although the FL's may be just a smidgen better in this regard.
They NO's really come into their own in close in, dark woodland birding where their slightly warm tone (which makes the greens of foliage really stand out), picture window like AFOV, steady view and good DOF make them virtually w/out peer.
Put them on a tripod with one of those Nikon sleeve attachment devices, and you will also have a killer astro glass.
kindest regards to you and yours this Holiday season,
UTC