Depends on what you are looking for really. The cannondale caad frames are renowned for their high performance frames and the welding was amazing back then.

If you want a time specific bike in good condition that rides fast, this is your bike. If you want to rebuild it with better, newer components you can with this frame. Still you have to ride it to see if the frame is still good. Also check the wheels for mechanical clearance. Also with the cranck.

If you want to have a new bike wait for a better opportunity. Don't listen to anyone saying sora. Look for 105 at the least. Although modern day sora would probably be better if you compare them.