Yes, I have also installed RasPlex onto SLICE using the same approach - works a charm and took just a few mins.
Tip for anyone else trying it: During setup, you'll be asked if you want to pre-cache the library - you should allow this. Takes 10-15 mins but will improve performance no end.
It performs pretty well, occasional lag, but nothing too troubling. Fingers crossed when/if computer module 2 comes out it'll work ok with this and give it that little boost.