I think "Bejahu's" review sums it up nicely for me ...
A masterpiece. The quintessential male fragrance. Strong, confident, masculine, and powerful. The difference between the EDT and this is like the difference between drinking a complex lager beer (the EDT) and a rich, thick, chewy porter or stout. Egoiste Concentree is rich and dense and oily and... strong. It is a burly beast when you first spray it. The tangerine is sharp and strong: boozy, almost. After five minutes or so the fragrance settles down and the deep, wonderful brazilian rosewood takes over. The damask rose is prevalent throughout. It is a not a "pretty" or "delicate" rose: it is a very dirty one that has an almost chewy and jammy texture. The rose is very masculine and it works excellently with the tangerine and woody rosewood. Also, there is a subtle animalic presence lurking underneath. This stuff is bold, and powerful and unequivocally the diametric opposite of the lightweight, playful aquatic concoctions that have flooded the market recently.
The sillage and longevity are incredible; legendary, perhaps. It is rich and dense and needs to be sprayed with restraint. You WILL be noticed. And you WILL get a headache if you over spray it. If applied with discretion, however, the juice is heavenly. I'll go out on a limb as say that Egoiste Cologne Concentree is THE best winter masculine fragrance ever created. I cannot fathom ever wearing this in the summer. It is just too massive and dense.
If you like the EDT, I you will love this. I strongly recommend it. In fact, I cannot recommend it strongly enough. There is a reason why it is so highly sought after. When you wear Egoiste Cologne Concentree you project confidence, power, and gravitas. Absolutely marvelous. If you can find it, buy it immediately, because it will probably not be on the shelf the next day if you walk away.