Two weeks ago, I bought a Super Agata bench capper.
I tried it out with a few different manufacturer's caps and standard 12-oz bottles and couldn't get it to cap the bottles very tightly. I did put water in some of the bottles and could turn the bottles upside down without any leakage, but you barely had to exert any force at all to pry the cap off. I feared that highly carbonated brews would not be safe as easily as the caps came off.
I had purchased it from Great Fermentations in Indianapolis, IN. I called them and asked about it. Great customer Service! They pulled a new one off the shelf, tried it, and reported the same experience I had! They said it had recently been re-designed ( I don't know about the Super Agata capper, but most re-designs seem to reduce the manufacturer's production cost and the quality of the product) and they would contact the manufacturer about it.
They emailed me a shipping label to return it, and refunded the purchase price.
In the meantime. I'll be using my wing capper and thinking about what to try next. I may try to attend some auctions to look for one of the old cappers from the days when every farm wife made and bottled ketchup.