I'm not an expert on fragrance, but I can tell you about my experiences with this line. I've tested many of Ayala's fragrances and I've owned two (I finished one off and need to reorder it!). The fragrances are very, very concentrated, and a teeny drop lasts and lasts. From what I can tell, they are of exceptionally high quality, and Ayala is a brilliant creator.
I hope you get your samples soon and find something you love. Keep us posted. If you haven't already ordered a sample, I recommend trying l'Écume des Jours. It's fascinating. I've never experienced anything quite like it...I had such a visceral reaction the first time I wore it, I felt like I was reliving a memory! l'Écume des Jours is one of the most unusual and beautiful fragrances I've ever tried. It's olfactory poetry.
(I'm not affiliated with Morel's company in any way, but, as you can tell, I'm a huge fan!)