No opinion on the seller but my advice is always view before you buy. If you can't travel or it's too far leave it and wait for a more local bike. I didn't about 3 years ago, it was a dealer with a nice website and it was a mistake. Funny when I think back now, we spoke on the phone and I was assured it was all in good order and ran nice. He even had his "mechanic" check it over! You live and learn...
Dealers or private selling obviously want as much as they can for a bike, some will be more honest than others. Plus at the end of the day a used off road bike's value is subjective and so is a description like "runs well" or "needs tiding". You need to see it in person to decide for yourself.