Don't use them for tabbing or anything cross country as they (a) aren't too well supported around the ankle (b) have fairly shallow cleats and (c) don't have overly stiff construction over the upper arch of the foot.
They are excellent for plodding about.
They've got light insulation and the usual waterproof membrane.
Bottom line: not a combat boot. Useful for urban stuff.
While we are on the subject, I've worn most types of Magnum Hi-tecs for over 10 years on and off duty and can seriously say they are excellent - but only for urban use!
I need to get some boots for light tabbing/field work with my Air cadets. What about issue pro-boots, unlined? I hear the gore tex ones have advantages, but if they do get wet, they stay wet longer than the unlined ones. Any truth in that? Last time I wore a military boot it was DMS high, and it did me no good at all!