Smoothest: hatrick, ministar, punchline.
Longest Spinning: Hatrick
Most Unresponsive: protostar.
E1NS 09 Note, not my favorite throw though. 
Hatrick and MiniStar
2010 Severe and Genesis.
Mosquito
Bad thread. I’ve had a mosquito that had a 5 minute spin so…
I don’t count my yoyos’ spin times, but my smoothest yoyos are all my General-Yos.
G-G-G-G-G-G-G-5!
What General-Yo yoyos are those then. Let me guess, Hatrick and Mini-Star?
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And 5Star.
Legacy FTW! Yes, I use plastics a lot.
888 is the smoothest I got. All my others are bricks, just how I like 'em.
Y-Factor!!!
My Magnum is my smoothest yoyo. It is extreamly long spinning, allthough I don’t check my spin times on my yoyos, when ever I complete a trick, this yoyo is still spinning really fast. So I guess you can say it is my longest spinning throw. And about unresponcive. Well, all my yoyos don’t come up on a tug. So I guess I would have to say my entire collection. 
~James Reed!
My YYF Primo would definatly have to be my smoothest throw and the rest of my throws fill out everything else.
mine definately a juggernaut
If I may ask, what did you do to get that?? O__________O
i have to say the longest spinning most stable in my collection is the genesis.