Ok in everyones mho ascent or solo
I own both, the Solo having been my primary for a long time, even over my Volcano. I have to say, after dealing with a ton of issues and messed up units/chargers, I've finally gotten it all working right, sort of. While I LOVE the Ascent, with it's portability, stealthiness, and most of all battery life, I still believe the Solo is a far more efficient vape. But take into account I may not have perfected my method yet, and it may prove to be better.
I think the Solo is far easier to load and use, since you don't have to worry about vapor escaping through the bottom. But the battery life of the Ascent is amAAAAAAAzing. At half battery, I'd have already vaped twice what a full charge would have gotten me from the Solo.
I'd say it like this:
If you want a super efficient vape that's easy to load, and you don't mind having to vape for 20-25 minutes, and you tend to primarily be a "solo" toker, get the Solo (along with a PVHES Turbo stem from PlanetVape.com, approx. $25).
If you want a super stealthy vape with no extra parts you need to carry around, gets the job done in 5-10 minutes, has a crazy good battery life (still don't know how they managed this one), and can take a load for multiple people to share, get the Ascent.
Or... if you're like me, get both, along with other vapes that spark your interest, and figure out which is best for different situations!
edit: Also have to mention, I haven't had any issues with my Solo, so I can't speak to their customer service record. But DaVinci's customer service is really quite good, possibly best in the business. If you do end up having any problems, they will fix it for you guaranteed. Especially their rep. here on the forums. That individual has changed my view of the Ascent and the DaVinci company from something very poor to something very, very good. They are a company that truly cares for their customers, end of story.