It is definitely older than 2 - 3 years old so I'd wonder why the seller is giving an incorrect age. If you go to Specialized's site, they have bikes back to 2002...and it doesn't look like any of the Rockhoppers on there.
Review(s)? There's only one. Keep in mind that the review from November of 2000. Technology has changed a bit in the past 5 years. This dude paid $830 for his new back in 2000. So, that makes this bike 42% of the total cost of a new one. I think it's a little steep. It may be worth looking at if it was cheaper, but I'm not a big fan. Who knows if it's been barely ridden. If it's been barely ridden, it's probably been barely maintained. I'd suggest looking at a new hardtail or maybe a nicer, gently used hardtail no more than a couple of years old.
he already has a hardtail as he explained in another thread he started about the same bike.
Got it. I didn't have all of the information at hand. In that case, I think that you might be able to get it on the cheap if you ask. Depending on what you're riding now and how low the seller is willing to go, you may be better off spending upgrading the HT you already have. Just my 2 cents.