The gas supply place "American Gases" that I visited, transferred the account to me, so I can exchange tanks freely without problems. They did not even charge me any transfer fees. I convinced them that I am a legit buyer. So I am no longer worried about title to the tanks, etc. Their prices are very reasonable compared to another place (Terrace supply).
The only minus was that the guy was 40 minutes late to open.
Today, I filled up a argon tank (second to me) and oxygen tank. As I said earlier, there is at least some acetylene in the two acetylene tanks (145 and 397 CF) so I will use it up before refilling. The seller told me that the acet. tanks are full.
I bought a O/A welding and cutting tool kit on ebay made by Matco
SteveB, you are right and I will not use that hook.
Fran, delivery is $17 flat rate, so maybe I will use their delivery but maybe I will not, so as not to freak out the neighbors.
I think that, all in all, the deal was good.