I hope you wrote the companies of the irons that didn't work. The R iron is famous for not working. I have had 6 of the O iron. The one that little legs jump up. They all dumped water. When I told this at a recent trade show the person there told me to "come back when I didn't have as long to stay." Such an insult.
Seems the most frequent answer is to get lower price irons and when they start acting up, then junk them.