Unfortunately, Fumoto introduced the F107SX about 1.5-2 years after I bought the F107N.
Yea, the f107SX was fairly new when I decided to install a Fumoto, I though about it, but went with the 107N anyway - At the time is just seemed like the SX had more places with its o rings that could potentially leak in the future and as I said above I like the longer nipple - I want to be able to put a short length of tubing on it. As to being upside down, it doesnt bother me - I figured when I got it that it would end up where the threads got it and was actually pleased it didnt end up at some odd angle