i wouldn't worry about the china tank, they won't fill it- they will just switch it out for a full one at the welding supply. even if it did fail it would just leak out- prob slowly. although you may get it back some day! my 2 cents- they are both too high. look for a used one don't buy a new one. most welding shops will even take a soda or beer co2 cyl in on trade or another size and pay you the difference or you pay them. the only thing they won't take is a medical o2. so check around you can prob get one for under $20 for that size. i would get co2/ argon and save some money if you will be welding mild steel. good luck.