I’m waiting for the next version of the unofficial CyanogenMod 11.0 (ION based) for the Galaxy S Plus (GT-I9001) before installing it on my wife’s SGS+ – if I can get her to hand it over to me for a few hours ;-)
I guess it’s safer to wait a bit longer; there are still a few wrinkles to iron out if I understand the latest posts on the thread. In the meantime I can point interested readers to the SGS+ Wiki page on the XDA Developers site. It contains a lot of interesting information and links if you’re contemplating upgrading your phone to a more recent Android version. And if the choice in the Wiki isn’t to your liking, hop over to another thread that has even more choices.