OK, I have been using the Mamba for over a month now, it has been used in conditions from snow to baking heat (Only a week apart but that's the British weather for you) and it has proven to be every bit as good as I expected.
It has not misted or fogged, the clarity is second to none, looking into shaded areas for dark objects, I can easily pick out every detail.
I have been playing with the mag/parralax settings for use in HFT and I have found that using 8X and 25yds I can see the killzone on a 10yd target relatively easily but, I have no trouble seeing from 12-45yds at all. Just a bit fuzzy as would be expected.
I have been lamping with it and on 4-6X it is superb, no fading, fuzzing or searching for a bunny in the lamplight, the field of view is brilliant, enough to easily find the target, not too much to lose it altogether or too little so that by the time the target is found, it has run off.
I fully reccommended this scope, it is versatile, clear and incredible value for money.