I have a 5lb aluminum cylinder ready for a refill soon. I bought it used from another member and it works fine. Well, I have two options. Only two places near me do refills. One does a refill of your cylinder for $20 plus tax. A little steep. Then the other one which is a company near me called airgas, they do a tank swap for only $8. My question is, does any here do swaps instead of fills and are the exchanged tanks just as good? I just want to know if the tanks you get are usually good quality from a swap place or are you better with one you got.