I've sampled various ones from the line. i think Malone does have a sort of signature "feel" to them, in my mind they're all sort of light and airy with a bright sparkling fruityness or so... I think some feel they lack sillage and longevity but I do find they're ok on both but just hold close to the skin. My clothes still smell a day later but the sillage is minimal. I'd say best for hot weather.
Of those i've tried, I've only ventured for larger decants of the sweet lime & cedar and the Pomegranate noire, though black vetiver also peaked my interest. I think there is some talk about the company in one of Burr's books, maybe Emperor or scent?
I think they're usually about $1.50/ml, so the mix pack is a slight premium but I'd think it's worth it to be able to try many at once.
As for layering, that's something I haven't experimented with much but I'd be curious to hear what happens if/when you do.