If you've had any of the Cain line...just think of the Cain Nub as that cigar, but in a Nub size. They're MUCH stronger than the Nub Habanos. I'll smoke regular Nubs all day and be fine, but I had to stop 2/3rds of the way into my Cain Nub Habano because I was getting dizzy, and I rarely get nicotine spins when smoking a cigar.
However, that's not to say I didn't enjoy it, here is my review from the one I smoked:
http://www.cigarasylum.com/vb/showthread.php?t=33668