Bruce and Joe,
Congrats on your new cookers. You'll love them....trust me.
Here is a condensed version of what to expect..
1) Overload your Pro Q and the original legs will fail. Trust me, this isn't from experience, but from the Pro Q head honcho that I have discussed this with. If you need help with the Pro Q leg mods, just ask or look in the pro Q section of this forum.
1a) Overload your Pro Q with the original legs on uneven ground and.......see 1 above.
2) Unless you are really, really dialed in, bullet style cookers are not a 100% "set it and forget it" cooker. If that is what you desire, Stokers and Gurus rock as additions.
3) Metal handles, yup...they get hot. Great advice by Ron, add the wooden dowels or maybe insulate your hands. We use gloves.
4) Check out the Pro Q section here for temp info on the different stacker levels. They do differ, and you will eventually get it figured out.
You will both be able to cook awesome Q on the Pro Q's....good luck. If you have any questions, feel free to ask and someone will hook you up.