Purple heart is one of the less toxic woods that I have worked with, but people can certainly have reactions from it. Anybody can be allergic to the oils or dust of any wood. It is true that oily woods are more likely to be toxic or cause reactions, but there are plenty of exceptions on both sides of that. One of the most toxic woods (in dust form anyways) is the very dry century plant, and some very oily woods like olive are relatively non-offensive. When used for shafts, PH provides a very stiff hit, best suited for jump/breaks or billiard cues. Getting the pores sealed for use as a shaft can be a pain in the ass though. As for looks, it is all personal opinion, some like it, and some don't. My wife plays with a purple heart and ebony cue that I made for her, and she loves it. The only issue I've had working with it, is that the pores are really big, and it takes some extra preperation before applying the clear coat. I have not come across the perception that it is a less popular wood, but what do I know?