So I tried the 10, 15 and 21 yesterday. I'm not a big Macallan fan (lately), but these actually were pleasant.
The Brand Ambassador swears that these new productions do not drain off any of Macallan's traditional products. Supposedly these whiskies were always produced by Macallan, but generally sold to blending brands like Walker Chivas Famous G. etc. So their claim is they shaved off some whisky that would generally have been sold to blend.
The Brand Ambassador also was enthusiastic that Macallan would now have 4 products on the market for under $70.00 US. If I understood him correctly the 10 & 15 of this Fine Oak collection would be under this price and I assume he must be counting the standard 12 & Cask Strength bottlings as the other two.