I had one back about 1980 and used it till it wore out. Must have made 2000 or so. Here is my advice
1. It can be fun making your own caps....for a while. Then it is tiresome.
2. If time is money, you aren't saving anything. I was a student with few funds and some time to kill, so it worked out for me back then.
3. Don't rely on them. I think they had about a 75-80% sucess rate. OK for plinking.
4. When they fail, they shoot paper down the nipple and don't set off the charge. To set the gun off, you then need to use the hottest production cap you can find to burn past the paper.
Good Luck, Have Fun
Your Obt Servant
TxRambler