I use them, Ive had one in my 51 for about 4 years now. Im running fuel injection and the only problem I have with them is when I recharge it "clean and oil the filter" the O2 sensor triggers the check engine light to come on for a few minutes till it warms up then it go's away. After a week or so it's fine ?
"I" think their worth the money.
Todd

Some people are like Slinkies, Their not really good for nothing... But they still bring a smile to your face when you push them down the stairs.

1951 3100 350 TBI Gallery Toddzilla... "$old"