How depressing that such an interesting and worthwhile thread should have degenerated into a ritual slanging match and points scoring exercise.
This is an important topic and an informed debate could have been extremely useful to beekeepers like myself who are relatively new to the trade/activity/hobby whatever.
I appreciate that any group of three beekeepers will have at least half a dozen different opinions on any matter. But how nice it would be if contributors could share their experience in a constructive way rather than belittling the efforts and conclusions of others.
After all this is not a war in which any one beekeeping dogma has to prevail. Progress in breeding Varroa resistance would benefit all beekeepers not to mention the bees, so let's turn this into a worthwhile discussion rather than just an opportunity to beat up other contributors with a different point of view.