Great fish! I have had them in the past (blue, green and red varieties) and can say that they are indeed sensitive fish that seemed to contract velvet quite easily. Velvet seems to be the scurge of small SE Asian fish IME. Once they settle in, they are pretty straight forward. They are really nice in large groups and will school like Harlequins. These guys have the same impact as a school of P. simulans would, but the blue is a bit more iridescent than reflective.
I think the the blue ones are the nicest of the three. the green variety is not as bright and reflective and the red variety is only stunning when the fish are really happy, otherwise they are quite brownish.
A hobbyist here has bred them (quite a few in fact) so if you are up to it, it is entirely possible to increase your group.