I have no experience with an SJ, so I can't help you there, but . . .
As far as the doser and the "drop" is concerned, I've noticed far less "left throw" with the CMH than I suffered with the Mini (again, I can't speak to the SJ). Also, the doser mechanism is completely within the doser, rather than having that annoying nut and arm on the outside as with the Mazzer.
Secondly, the grinds do not "gather annoyingly on the dosing mechanism."
And while you didn't ask about this, I will add: although I have yet to do it myself, I do suggest (and will eventually get around to doing it myself) the "throat modification" with the PVC pipe/funnel shown (see La Cimbali Junior Grinder Mod - Hopper Throat Extension. After four months of using this machine on a daily basis, this mod resolves the only complaint I have with this grinder . . .
As far as the SJ goes, I suspect that the difference between the SJ and the CMH is far less significant that it is between the Mini and the CMH (or the Mini and the SJ, for that matter). As you know, I've said that switching from the Mini to the CMH was the single greatest improvement I've ever made to my espresso.
The Elektra I have now is superior to the La Valentina I used to use, and while the results are noteworthy, one can still see the connection -- if you will -- between them. In other words, I would still unhesitatingly recommend the La Val. OTOH, now that I have the CMH, I would now have a difficult time recommending the Mini to someone as their main, daily grinder -- only suggesting it as a secondary (decaf?) grinder or with the understanding that, down the road, one will want to upgrade.
Even with no direct experience using an SJ, I would suggest to people that the SJ is a worthwhile "keeper" as grinders go (based, obviously, on what I've heard from others).
Cheers,
Jason






