Take it along roads that you're familiar with, an unfamiliar bike (making four times the power you're used to) on unfamiliar roads won't tell you much. You have to try and be objective - you'll be riding the object of four years' desires and hard saving up (do you have a poster of one on our bedroom wall?) so if you don't like any aspect of it you have to be honest with yourself (which, given these circumstances, won't be easy). As you have the money in the bank (have you had an insurance quote yet?) it might be worth trying a few other litre bikes for a valid comparison rather than ride the S thou in isolation. On its own it will feel like an absolute missile in comparison with your 500 (unbelievably smooth and fast, but also big and heavy), but until you try some of the other similar bikes you have nothing valid to compare it with. You never know, you might actually prefer something like a Blade (which, in honesty, is a better road bike).
Also, ensure that the traction control is on, it could save you a lot of money and potential embarrassment.
