In what way? For my part the answer is no, I haven’t.
RMM has his MTN-MAXlp working well AFAIK. If I decided to work on a buck driver again I’d probably want to focus on either higher current or lower cost than RMM’s driver. I don’t think that the LED2001 IC can do either of those things for us. I might be tempted to look at the QX5241 again, or the more common QX9920.