I would pass on this bike if I were you. The rear derailleur is original and by this my guess would be that the rest of the parts are of the same age and likely worn out (or nearly so). The shock is a piece of crap compared to what you could get new today. In fact, the quality and function of today's parts/components will totally blow that old Stumpy out of the water.
Now, you're willing to spend $1500? Go for it. Even a $1000 hardtail will get you a bike that will totally amaze you. Do it.
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"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.