I bet you'll like your Underdog, Stu.
Solo is a good vape crippled by bad flavor and to a much lesser extent the battery life. I've had 3 now, 2 ceramics and one SS, and they all have an off flavor. A Plasticky-hot transformery-old sea shelly kind of smell. I'm using it less and less because of the flavor, because I have great vapes like the Underdog and LSV at home, and the MFLB does on the run and IMO has good to great flavor if you use proper technique. It really is excellently efficient and gives great clouds for a portable, and it's a shame that it tastes like it does. It's possible only some solos smell, or that only some people are sensitive to it, or..?
To keep things more on topic, I've been using my UD quite regularly. and it's been a real workhorse. Heat up time is roughly 25 minutes with the 12V, and I've had it running for 4 to 6 straight hours a day with no apparent issues. Vapor production is huge - better than the Solo, for comparisons sake - denser than the DBV or LSV for a similar pack, almost Supreme dense. This vapor output is of course helped by the very generous air flow. My only complaint is that I wish this Underdog had a dial! I have a 13V on the way to crank up the heat, so that should rectify my only complaint of not being quiiiite hot enough for my tastes. My UD continues to impress both me and others, and I've taken to just leaving it out sans stem at all times.