It is worth it to buy media. Make sure your regulator second guage tops out at about 25, not 150 like welding rigs do, this will keep you from adjusting it alot. Also, I see the tubes are not connected at top, after filling with media they will tend to flex when moved, after leak test, fill in place to reduce the risk of something popping, it gets real heavy when full. Looks like a good quality unit, bravo