So, I recieved both. And, I gotta say I'm liking them both equally. The 4nine button is fabulous, nothing like the clone I tried. Now, I purchased it second hand so maybe it's broken in, but at this point it's smooth as butter. I have a Kayfun on in with no issues at all. The nano is sweet also, the lock is fabulous. Only issue so far is it stopped firing all of a sudden and even when I adjusted the top cap it wouldn't go. I took the bottom switch apart, BIG MISTAKE! All the magnets flew out and stuck together then I had to get them back in on repelling sides and get the switch back together and it was a pain in the A--, to say the least. But, miraculously it started working again, I really thing it was an issue with the top cap adjustment. Are the magnets in the bottom switch free standing or are they supposed to be glued in?