I have a 3-15x42 with the HSR reticle, which I like. Fine aiming point, usable hashmarks, and thick outer stadia that make centering the reticle easy, even in near darkness.
It tracks just fine as long as I can see the turrets. I actually like how quiet the detents are, but if you like 'tactile' 'audible' clicks you will be disappointed.
Optically the resolution is great, it's easy to get behind. In favorable conditions, it's resolving power blows a lot of other scopes away. The eyebox is big, but CA can be harsh if I'm not centered in the ocular.
This can be tedious on bright days - honestly I'd prefer a smaller eyebox, I'd rather have the eyebox itself tell me I'm not centered rather than have bad CA tell me the same thing...
Low light is not a strength either. Not bad, but certainly not as contrasty as some. Not a lot of colour shaping going on, so comparatively images through the razor LH seem a bit cold, or clinical perhaps. When it comes to judging subtle differences in contrast, it's easy to see the value of some higher tech coatings.
To summarize, my razor LH is great on sunny days, but it doesn't handle overcast or low light conditions with elegance.
Mechanically it's good. Mine is missing a fair amount of paint, so I'd say it's pretty robust too.
The magnification ring is a bit larger in diameter than some others. I couldn't mount the scope all the way forward on my tikka because the mag ring wouldn't clear the base of my talley one piece (low) mounts. Scalloped the base, problem solved.
This is important because the Razor LH has about 1/4-1/2" more eye relief than other comparable scopes - something to be aware of anyway. The combo of fat mag ring, longish eyepiece and longish eye relief could cause mounting problems for some.