I have one of these and have been using it for a couple years now during my full time life. Absolutely love it. I consider it to basically be a wood fired stove/smoker.
Here's a tip: The one maintenance thing that needs to be done periodically is to pull the grills and grates and clean ash out of that 'tuna can' burner assembly and surrounding area. The individual pellets only leave a tiny amount of ash but it does build up over time. The GMG shut down procedure does blow most of the ash out of the tuna can but it will still build up (this is one reason to never just unplug it when done cooking - always push the button to turn off the grill and let it go thru it's own shut down procedure). A shop vac works great.
When to clean it ? Obviously this is based on usage. I was told to watch for when the grill seems to have a little trouble holding the chosen cook temp. I have also noticed that mine will start taking longer to get to the initial temp upon start-up - might be because that burner rod that sticks into the tuna can starts getting covered by the accumulated ash.
There is lots of discussion about which brand of pellets to use. Pelletheads.com might get you started.
Looking forward to your posts.
** GMG makes two nice covers for these and I have both. One is a cover to use when it's sitting outside. The other is a zippered travel 'bag'. Fold up the legs and sit the grill inside the bag, then zip it closed. It has two heavy duty carry straps, but it's still real awkward (and heavy) to carry.