Hi George! Welcome to "Club Lazy Q!" If you liked what you tasted from the MES, just wait until you taste what you can do in the SI! It will be a bit of a "transition" for you, from stick burning, but not too much. You'll find you don't have to rely on all of the techniques you've used to counter the "drying effect" of the heat source (burning wood). These smokers are incredibly tight and retain moisture very well, so all of that spritzing, mopping, foiling, unfoiling, etc., isn't necessary! Focus on food prep, and wood selection, and find something better to do when you get the meat in the smoker!
If you don't have a small digital scale, I recommend getting one. We deal in ounces of wood - definitely not what you are used to! The most we use is 6 oz, for a long smoke (briskets, butts), but many are 3-4 oz! Hard to gauge that without a scale. Unlike the MES your friend has, you will load the wood when you start the smoke, and won't open to add more. Easy peasy! 8)