I think by and large the PCAC Evercools are okay but there have been some issues. Of course, that happens with almost anything.
Lumenlab not too long ago stopped selling the Evercools due - in part, I believe - to these rare early failure problems and maybe because they didn't move quite as much air as they were advertised as moving.
They're still available elsewhere and from what I've seen of the two I have (bought a spare

) I personally wouldn't hesitate to buy another one.