yes they are more consistant, with a mag you don't need any regs, the valve has one built in. Not sure if they are more efficient or not.
you also don't need any extras, just hook it up and go crazy. I have bought all my tanks except one used, and I have never had a problem. Ask for pictures and look for any deep cuts on the fiberwrap, and get pics of all sides. Ask them if they used a tank cover, because without one they can get alot of dings. I would not hesitate to buy used, check out pbreview.com before you buy to make sure you get the best for your money, from what I have seen you can't go wrong with crossfire but thats just my opinion, but I have also used system X and ACI bulldogs with no problem even though the reviews aren't so hot on those last two. Also most people selling on the forums have feedback check that out first, make sure its all positive, same with ebay etc.
you also don't need any extras, just hook it up and go crazy. I have bought all my tanks except one used, and I have never had a problem. Ask for pictures and look for any deep cuts on the fiberwrap, and get pics of all sides. Ask them if they used a tank cover, because without one they can get alot of dings. I would not hesitate to buy used, check out pbreview.com before you buy to make sure you get the best for your money, from what I have seen you can't go wrong with crossfire but thats just my opinion, but I have also used system X and ACI bulldogs with no problem even though the reviews aren't so hot on those last two. Also most people selling on the forums have feedback check that out first, make sure its all positive, same with ebay etc.

. Also if you are going to buy one check if it comes with a cover because that will run you another $20-$40 too this doesn't seem like a bad deal
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