So..... when the power button on my Solo II broke, I figured maybe time to upgrade. I got a solo 2 Max. It was a total mess, electronics malfunctioning after a single use that drained the battery 50% in one use! SO.......... I returned it and upgraded ( so I thought ) to the Solo 3. First unit ran WAY hot first hit fried my lungs to the point I couldn't vape for 3 days! Sent it back under warranty and Arizer replaced it. This one worked but the vapor was still VERY harsh, even with the temp turned way down ( 350F ). I run my solo II at 390 F and couldn't ask for a more perfect hit! So I'm sending the Solo 3 down the road and I just got another Solo II. Used it last night, works exactly like my old one, perfectly! Now I'm considering a Air SE to replace my Argo.