Very good. Sad to say I have used them with a few of my Products. In fact, my P5 is headed back to them as we speak.
I don't think this is good service. Look at the inconvenience this has caused you.
With a problem like that a manufacturer should realize they have two options.
1). Buy them all back and junk them.
2). Recall them all and install a redesign of the problem circuit.
Option 2 is what Peter Walker did when a problem became apparent in early production of the 33 preamp. It was fixed permanently for those customers and pronto.
John Deere have always had this policy in their famous "Contract with the Farmer." The early model G tractors had too small a radiator and overheated. There was not room for a larger radiator, so John Deere bought them all back and junked them.
The odd one was not sent back and if you find one you have won the lottery. They are very valuable because of scarcity!