I'm primarily a road rider but we've been having a pretty wet winter here and I decided to buy a mountain bike since I hate riding on the road when it's wet out. I bought a 1998 Gary Fisher Joshua on CL and once my girlfriend saw it she decided she wanted to go mountain biking with me. So I wound up buying this 2000 Jamis Exile as well and I gave her the full suspension bike because she likes the soft ride of it. I paid $250 for both bikes.
Anyway, I have plenty of experience building up road bikes. I often buy them cheap on CL then fix them up and resell them for a profit. I have no experience with MTBs though. I know most of the mechanicals carry over but suspension in particular is foreign to me. I have no idea what the shocks should feel like or how long they last but I'm assuming at the very least the ones on the Fisher are toast since they're well-worn on the outside and I'm assuming they've never been rebuilt. The guy I bought the Jamis from said the Manitou on it has been serviced but I don't know to what extent.
The girlfriend and I have already gone on a few rides together in the Oakland Hills and we both like our bikes. Money is tight right now so assuming the shocks are safe to ride on I'd rather just go with it until I can afford to get a new fork for each and upgrade to front disc brakes (rim brakes just aren't cutting it in mud).
Is my plan reasonable or should I be worried about the forks exploding and sending me and/or my girlfriend face-first into a rock?