As jallerton (that's Jeffrey Allerton, an English international player btw) already mentioned, not showing the minor when it is unnecessary is one of the advantages of opening 1NT. Most of the time, a strong 6322 hand is going to be showing its minor at the 3 level so we are not really saving bidding space by opening 1m - the information leakage on the other hand is another issue. Your reference to NT defences rather confuses me as I cannot see the relevance to this topic. I would not say that a large number of world class players use DONT (not Don't, it is an acronym for Distub Opponents' NT) or Brozel. DONT tends to be most popular amongst club players, particularly in the USA. Multi Landy, to name but one, is far more popular amongst world class players. In the UK, where I grew up, almost noone plays either DONT or Brozel. Lionel is a perfectly decent NT defence and also has its adherents in the UK. It is not my choice though and I am not overly convinced by your argument of it being "more useful". If you are interested in discussing this, I would suggest starting a new topic though, rather than risk threadjacking Fluffy's discussion.