I've also heard that Smokin's is a little more mellow than the Mervin boards. Never compared the two though.
I've only tried magnetraction boards in normal conditions and I find it too grabby. I'm sure it's something you'd get used to though. I found NS RC boards to be squirrely at first and grew to love it.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz