In reply to Somerset swede basher:
15kg is a bit lardy but steel frames are always going to be heavier (my steel hardtail is heavier than my carbon-fibre enduro bike!). Personally I don't mind the weight though as I like the feel of a burly steel frame that will shrug off anything that you throw at it.
I would point out though that 15+kg is almost certainly not all the fault of the steel frame - to get that heavy it would need to have heavy forks and wheels too. It's perfectly possible to spec a steel hardtail at way lighter (though probably more expensive too).
More than the weight, the biggest difference that Mrs Swede (or anybody) would notice would be the jump to modern geometry and 29" wheels. A Huntsman (or any similar bike) rides so completely differently to a 15yo 26" bike that it might be disconcerting at first: the combination of (much) larger wheels, a slacker head angle, and longer frame makes for a very different ride.
So the idea of a test ride somewhere first is not a bad one.