Well, Corel didn't do any good to anything they bought. Bryce users are complaining, and KPT are only worth buying if you find KPT5 and/or 6, although they are a bit dated. Either we have gotten accustomed to too much eyecandy, or we have grown too serious.
With5 you also get 3, which works still fine under XPPro and PS7.01, although the interfaces are very small on a monitor larger than 1024x768. I personally find 5 the best set. I found both sets here in a shop that sold its "old" software, and paid the equivalent of some 60 USDollar for both. I've always been fascinated by this plugin, but I must add that I rarely use any of them. I suppose they date from the PS4, perhaps 5 days, and many things have been added to PS itself.
If you want fractals, then Ultrafractal is far superior (Win only), and fraxflame has lost its attractiveness since apophysis came along.
etc etc...
They were great and even outstanding, but, well, it's a bit like lensflares. Or the Chrome filter, or the plasticwrap filter. Or polar coords. A bit too recogniseable.
my idea.