There's not going to be residue under the electronics that's going to make any sort of issue for shipping, don't worry about that, also there's no reason to clean the wood, you just have to clean the glass and metal parts that are all removable... Just the vapor path! You'll see when you get it, and take it apart for the first initial cleaning
Yes, it is fine, easy to hold in the hand and press the button, also easy to hold upside down through glass j hook or water piece, the session feature is nice because it is holding the button down for you basically (but I only use it for one hitter bowls really because I like to fully clear the heat and vapor each hit, which is much easier to do with on demand mode holding the button to power heater)
Xmax v3pro is a great budget unit, great way to try pure convection on demand, but yeah the power and versatility and purity cannot compare to the TM of course (Mighty is session conduction hybrid, not in the same league imo)