Refilling is easy
I have had great experience with refilling and traveling with my cylinder. Scuba and paintball shops can refill it no problem. The fill port on it is a standard 1/8th inch paintball fill port so scuba shops do need an adaptor but it seems to be a common adaptor and most scuba shops have them. When you go on trips I would definitely plan ahead and make sure you know where you going to get your cylinder refilled, but I have had no issues. BCA has a map on their website where you can search for BCA certified refill centers. You can travel on a plane with it as long as the cylinder head is unscrewed from the cylinder and TSA can see inside it. I have never even been questioned at the airport.