why are there so much models ?
what is the difference ?
are you sure its worth to buy such strange product?
I thought its great Canadian tool but not I have doubts.
There aren't really. There are basically 3 models. First with ceramic lined bowls that chipped and were replaced with the SS version we now have. Along the line the way the 'battery meter' displays remaining energy and what temperature each step is was adjusted, but no real change from a user POV, just different settings.
Finally we seem to have a third model change where the charging/PA works differently which includes some hardware change (larger holes?) that seems to have lowered the temperature a bit, again no practical change in performance I suspect.
Against this is a lot of guesses and assumptions about what we're told are not model or even serial numbers but some production coding that's not always even in logical order? We've seen several cycles of someone noticing a different number and deciding it's a new model with some highly desirable (or equally tragically bad and to be avoided) feature. New is not always better, witness those who want the original ceramic bowl units now, which are only available used (and without warranty).
There are no units with ceramic bowls and the new charger scheme. Nor are most Dealers in a position to offer different versions, they sell what they have in stock..... Right now there may be some 'old version' in stock, but soon only the new version will be available if that's all Arizer is shipping.
As to the question 'is Solo worth it', I suggest there's many hundreds of guys reading this thread who think so, you don't get to 20,000 posts with 1.5 million views discussing junk.
OF