Never head of the Roffu, thanks! I'll lookup some reviews. The device looks great and it seems it can make use of dosing caps too.
Also, I didn't even consider replacable batteries but using those will make life much easier :)
I think the Solo has great taste and I believe some say it's both...
I've been using an Arizer Solo for about 8 years and I like it alot. The glass stem however doesn't make it really stealthy or portable enough to take it outside. So now I'm thinking about buying a 2nd vaporizer and can't really decide between the Pax or Xmax V3 pro.
Most important features...