Treadmill - Life Fitness 9100HR - advice

I'm a regular runner, but don't take it too seriously. However my new job has made it more difficult for me to run when it's not completely dark.

My parents haven't exercised in years and now they're getting older they'd like to. My Dad has suggested getting a treadmill a few times but has been put off by the prices for a half decent one.

We've recently come into some money and now is the time (not least because we keep racing dogs and it'd enable my dad to train them on it too!)

However, we're struggling with what to buy. Having used gym-standard ones my standards are quite high...

However, there seem to be plenty available on eBay that are gym-standard being sold. For example here: http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=110995248757&ssPageName=ADME:X:AAQ:GB:1123

However, I have no idea about the build quality of these things. £400 is very cheap for what it is, but are they designed to last? Would we get years use out of it?

I know people can't answer these questions as they don't know about the specific product, but if anyone has any experience with treadmills of this nature do they last well (so if they're in good knick they're likely to stay that way?)

Any advice/comments would be great.

Thanks