Ultradyne, and the guy who designed those lobes (Harold Brookshire), are legendary.
He also designed the Comp XE and Lunati Voodoo lines of cams, which are some of the best ever 'off the shelf' grinds (in their day.)
BUT, I believe most of the Ultradyne cams were custom...which means custom for somebody else's setup, not yours. And this would be a very old grind by now. I believe they've been out of business for decades. So a modern grind from the Lunati Voodoo line (designed by the same guy, but perhaps 10 years newer design) would probably be better.
However, for the right application, that probably would have been one of the best cams you could have bought (just because of who designed it)...20 years ago.