I'm not at all any expert, but I did buy that exact kit.
I like the foam filter over the HD setup, it comes with both a green and white version and the white is a smaller pore size for better filtration. Overall, I think the only real advantage is a larger surface area so it can probably run longer before getting too dirty.
Performance was pretty close per some flow testing done previously. You'd have to run it without the top cover to get the most out of it.
With that said, there's the cover. Don't expect the cover to fit very well and look factory. For starters the cover is a very different bright orange than Stihl uses so it won't match. Also there's plenty of gaps around the front side, it doesn't really give you the impression that it's a perfect match like the stock covers.
In the end if you didn't have an air filter or cover from a parts saw or you wanted a filter that'll go longer between cleanings, I think it's probably a decent buy. I wouldn't hang my hat on some big performance gain though, and the fit/finish/cosmetic side is not very good.
My 2c.