I think it's fairly stable (internal SD aside) because this is pretty much the only post-ICS ROM where things like camera, brightness sensor, and in-call volume controls all work in the same ROM.
That sd card causes all sorts of weird bugs bugs especially with regards to installing apps.
I definitely get it's really stable for what it is and somehow it's the first rom we've gotten that gets a lot of things working from the go so I'm sure it's going to be better than most other roms for this device by the end of the month, but I wouldn't be so eager to recommend it yet. After using it for a while yesterday the browser stopped rendering, internal memory was inaccessible, and app installation was really hit and miss.
It's usable enough to try out, but as a replacement for something stable it's not really there yet.