The Extreme is a good one. I had the model it was based on-the V-Tower. He added digital and the fan (for bags) and it became the Extreme. The lifetime warranty is only on the heater-2 years for the rest (except glass). The vape was originally designed to show the temp of the heater, not the bowl contents. The heat sensor location was recently changed (closer to the bowl), so the 2nd generation shows a lower temp than the original. The vaping range on the current one should be approx. 220-240 Centigrade. There's no way to tell the difference in 1st vs. 2nd generation, but if you just bought one it's probably the new version. If that temp range doesn't work for you, move it up 100 degrees.

You can vape tobacco, but it may compromise your herb taste and make cleaning more of a chore (or more frequent). If you do it, I'd use a separate bag and use that one only for tobacco.