Yes - I also know people with non shaking 1.00's I wish I knew what the difference was too. I have even had them try tuning for me but they still shake. It seems that it is a pot luck thing - I bought both of mine at the same time for a project a year or so ago and I guess they both came out of the same pot. They seem to run smoother once the revs get above about 3500.

I have now put the two 1.00s in a semi scale B25 where the low speed shaking kinda complements the scale nature.

I'm still addicted to my Saito's though - in fact all of my personal sport planes (as opposed to the ones that the two teenagers fly or the competition planes) are powered either by Saitos or Gassers (50cc and above). I let the teenagers use the other engines, but they have Saitos too.