Is this a good deal?

its only a good deal IF the bike fits you

Need more details, the ad is way too vague. Email the seller and find out the year and model then go to Bikepedia.com and see what they retailed for. That will give you a much better feel for if its a good deal.

That looks like the db response, but i think its a diff model, the db response sport (I have) can be had for around 400-450 brand new. For reference, the response is the highest level hardtail db has in its lineup. They also make a comp model.

i dont think its a great deal, expecially if its not a response for that price