The problem with Paddletails is the fact that they are taken from the wild in China and shipped all over the world in pretty awful conditions. It isn't known what effect exporting thousands of them every year is having on wild populations, but it unlikely to be doing them any good.
Also, they are rarely labelled correctly in petstores or aquarium shops, so even knowing exactly what species you have with any certainty is difficult, and then there is their highly aggressive nature. They will often fight to the death over territory when two or more of them are confined to an aquarium, even newts that have lived together for extended periods can suddenly turn on each other for reasons unknown.
I will say they are reasonably straightforward to care for when kept alone, but with so many more peaceful, captive bred species available like Crested, Alpine or Spanish sharp rib newts available there's really no need to rely on any of the wild caught imported Asian species.