Bit of a necro thread at this point, but i have a 20ga version of the SL and it's worked well for the most part.
Doesn't like to eject challenger shells if you have too many of them, they seem to have a sloped rim and kind of a waxy residue that makes the extractor slip off the rim. Any other brand works fine and if i stagger one challenger and one different brand it works 95% of the time that way.
Other than that my main issue is that i should have jumped on the sale that wholesale was having in a bigger way and gotten a few more.