My 1.7x10 has succesfully made 2 trips to africa + abunch of moose/deer and bear hunting miles. I can't guess how many hours it has in the field.It has definately logged some miles bumping/vibrating in a plane and in a 4-wheeler scabbard,as well as rattling around on the floor of an aluminum boat(which I think is quite tough on scopes-certainly harder than being cradled in my ever-loving hands while I'm hiking
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). It has held up with no problems at all, I've never had a dead or dying battery. I did replace them before each major trip just as insurance. As stated there is room for a spare under one of the turret caps.
For low light applications I really ,really like it.
As far as clarity/resolution goes mine might be a bad example, I have a zeiss conquest 4.5x14 that edges it out on my resolution charts.It's still good, just not as good as I thought it would be.
Physically it is a BIG scope, the ocular bell in particular is quite large, on a bolt gun I have often had to mount it higher than I would prefer in order to clear the bolt throw. On a kimber/winchester/mauser etc- it has to be mounted very high to clear a 90 degree bolt.
If it died tomorrow I would probably replace it with another one exactly like it, it really does excel in low light situations. I like it quite abit better than the illuminated leupolds and nightforce that I have.
I do not have an illuminated S&B or zeiss to compare it with so cannot offer an opinion on them.