I would like to try some mtn biking this summer. We have a couple of trails in the near vacinity that aren't too difficult and I have a veteran lined up to help me.
I am 50 years old so I don't plan on doing anything too agressive at this point (or probably ever).

I already own an ancient Schwinn High Plains I think it is about 17 years old - I use it for my run about town to the grocery store bike. It has absolutely no suspension anywhere. (just read reviews on this bike - every one loves it)

A friend is selling his defected girl friend's Gary Fisher tarpon for $150 - it has been ridden twice. When I read reviews on this bike they were very mixed from "I love it, wouldn't change anything - works great" to "it is the worst bike I have ever ridden"

I am going to take it out just for a road ride this week but since I don't have a clue how to do any trail riding I don't even know how to test it out there or what to look for.

The bike is the right size for me.

So I guess is the Tarpon worth the cash or can I survive on my old High Plains?