so i am interested in both but i need opinions like are they unresponsive i am still testing for preference
m1-discontinued-its a good yoyo, unresponsive, undersized, good grinds
dingo-REALLY undersized, pocket yoyo, good grinds, smooth
i have both and i say the m1
i used to have both.i would choose the dingo.because its small and fun and you can get really good play out of it! 
but be sure if you get the dingo,beware.put the wrong bearing in and it tilts like the titanic.lol.also,mine came jam-packed with lube,so it was a we bit responsive.so be sure you have the stuff to clean your bearing.but otherwise,its my second favorite,yoyo.aside from my boss.
did you get yours in a trade because if you bought it from onedrop htey ship dry or with a pin drop of lube
nope.i got it from yoyoguy.when i got it,it was tug responsive,and dead silent.
then yoyoguy put the lube in then
thank you capt. obvious.lol ;D.jk
gosh ypu dont have to be mean about it jk
M1. Dingos too small for me. And too… erm… unbutterflyed?? But yeah. M1 fits in any pocket easy.