Recently ordered the gremlin power pack last saturday. A charger that I ordered through the store has been shipped and arrived, however the gremlin has not. Should I be worried? How long do these normally take?
Well usually it takes less than a week if your in the states. Have you gotten an email saying it's been shipped like you did with your charger? If not, I would give it a couple more days and then try contacting customer support. Half the time Jen, Josh Bixlers wife responds with in a day, and I can guarantee with her on the job your request/concern will be fixed asap. They can't keep those in stock, they sell like hotcakes, so maybe it's just a small delay with stock.
I'm sure they'll get to your email eventually, they're discussing it at the moment internally, and it appears the Gremlin shipped today since it took a little bit of time to get to your build.