Hiya, my mate has bought the SSE18 and used it on three game days, and he seems to like it. It's got fair range and it's rps is adequate, build quality is alright too. Magazine size is brilliant - these thin little mags have 80 - 100 rounds if I remember correctly. I wouldn't say it's anything particularly special, however it's got the advantage of being an AEP and not affected by the cold but I can't comment about reliability. My understanding is that Novritsch's own stuff is mostly rebadged and slightly upgraded, and it's obvious that him and his marketing team are pushing his products on new players. Personally I wouldn't buy anything from him - you don't get a reputation like that from selling good gear.
Good luck.