I've been using PhotoBrush and PhotoFiltre for over 3 years and found them to be the best for 98% of my work. I have PSP X and X1 as well as PhotoShop in various versions, but find them too bloated and slow for all but the occasional feature that is usefull.
One of the really handy features of PhotoBrush is it's compatability with PS filters(.8bf) and it's ability to scan your system and automatically install them in PhotoBrush, or just download filters from the various sites to a dedicated Plug-ins folder where PhotoBrush then locates and installs in seconds.
And where would you ever find another Oscar who will personally answer an email when you need some information on specific tools.
Take the time to visit the site and see for yourself