Haven't had the old-school Stone IPA, but Ruination and 10th Anniversary are phe-friggin'-nomenal beers. Two of the best I've ever had. Their Smoked Porter is excellent, I've never been disappointed by one of their brews.
I spent 3 day's a mile from the brewery, luckily they were serving a limited Double Dry Hopped IPA. I have to say they have the best beer west of the Ol'Miss IMHO.