I'll vouch for the awesomeness of this patch. Try it on your SD2SNES, you won't be disappointed. Kudos to the developer.
I also liked viewpoint on genesis, hopefully someone does take the time to give that one the treatment it deserves. The last level of steel empire is downright gorgeous and I play through that one often.. I do hate on the second level when you have to fly backwards though!Impressive, indeed!
BTW: I always liked the Viewpoint port on the Genny, but slowdown is strong with that one, so it could use one of those, too. Oh, man... and Steel Empire.