And it is "used," correct? If so, any amount of use means that it isn't new anymore and logic would suggest that the price would be lower than what it sold for new. Now, if it were the VTF3 Mk2 the add would interest more people.
One question that other people might have - was it originally purchased from HSU? The warrenty is transferable as long as it was originally purchased from them or an authorized reseller.
I'd actually jump on this, it's a great price and I've been wanting to upgrade my STF-2... alas I just bought a tube-pre and wouldn't be able to grab this until the end of September... if it's still available I will do so then