I used a Cera Loose Leaf, and it was worth it as I hate the taste of combustion (although I did resort to smoking some joints at the beach bar as I would have looked pretty funny puffing away on a Cera ... I was with my family and have 2 pretty young kids so I have to be somewhat discrete)
I vaped (or smoked if I couldn't make it back to my room balcony) about every 2 hours. I never got really high but kept a mild buzz on at pretty much all times which was enough so that I felt normal and could function normally vs being a mess going without my medication for a week ... at night before bed I would sit there and vape for an hour or so straight and get medicated enough to sleep decent, but it took some work)
The Solo would work, but if airport security decides to really go to town on it ... short of taking it apart and cleaning out the insides with ISO, I'd be concerned. The Cera core could be boiled, soaked in alcohol, flamed ... and the body is 100% accessible to all areas and can easily be wiped down and is 100% out of the vapor path anyways (which is why I felt comfortable bringing it).
Although my Solo, or Inhalater, can be cleaned so they look clean on the surface, I don't think I'd want to bring them through border security.