I bought one of the scales that goes up to 440 lbs. by OldWillKnot at eBay and it's excellent. The only problems that I've had have been because:
1) A friend of ours put a bunch of wet towels on it,
2)We had a leak in the bathroom that covered the scale.

I was so upset both times thinking that it was ruined, but it was fine after it dried out.

If you get the scale from him, make sure you send in your warranty information in case something like that happens to your scale. The company will fix it for you. I unfortunately, lost my information which is why I was really upset. Good luck and welcome to the forum.
Vicki