I'm not a huge fan of see-through mounts, usually, if they lift the scope high enough to really allow you to use the open sights well, they lift it higher than is comfortable for using the scope...So basically you strain up to use the scope and strain down to use the iron sights, you're never shooting comfortably.

They also heighten the profile of your rifle, it makes it a little harder to manage through dense stuff, and they're more prone to shifting from a bump (or poor construction).

I've used them in the past, and have one or two sets on rifles as I'm typing this, but they're not my favorite, I always prefer a big objective scope with variable magnification (3-9x or 4-16x are my favorites, but 2-7x, 1.5-7 etc are good too), low end magnification with a 52mm bell gives a good enough FOV for short range shots, even running shots. At least then you don't have to worry about sighting in BOTH sights and trying to remember the proper hold over picture for given ranges.

Usually guys, regardless of their cartridge's trajectory, will sight in at 100-200yrds with their scope, and then at 30-50yrds with their iron sights. I guess they figure if they're sighting in anyway, might as well make sure it'll be right for your hunting ranges-since they use the scope for longer shots and the iron's for close up running shots.