Mine broke on the third use, but before that I queried it with the supplier as it didn’t look right with the bottom bed raised, and I found that it squashed 5 out of 15 eyelets which I needed to fix with pliers, and one was so mangled I couldn’t do a thing.
The cube in the setter stuck in an eyelet, and eventually came out still in the eyelet so that was the end of the big bite!
I have heard that others have had problems but got a replacement which was better, but I have a refund. I would like to try another just for the grommet setting.
I hoped to buy one at the Shepton Mallet Exhibition after checking it out first, but there were none to be seen.