^ Besides of that i think if i really should give them a try at all and not just stick with the ones i know of being super-great, i.e. a-PHP, Peevee and crystal a-PVP? I found a-PVP in it's powdered, tiny crystalline version, for example, uninteresting and totally marked it off until i had a Batch consisting of big(ger) white Crystals with salt-like, chunky powder - which was the a-bomb and by far the best (well, besides a-PHP) of all the pyrovalerone-analogues i tried till now, even exceeding good ole Peevee, with it's fast, abrupt onset of action and a damn fine, decent euphoria, which i rarely if ever experience with stimulants, i.e. NDRIs.
As for a-PHP of which i unfortunately had the tan powder up-to-date, which was awesome stuff (but i'm sadly just as unable to source it anymore as the Crystal a-PVP, which is no surprise if you ask me) i've read the crystalline version should be even much better.
That being said, the differency in Batches or/and it's various forms a substance comes in, is so vast, so that no one should rate one until having tried a few different Batches beforehand. I say that because i did so with various Compounds and learned first-hand how wrong a single judgment by rating a single Batch can be.