Well, I can't in honesty say these are the best plugins I've used but they are definitely nice ones and for free, you have nothing to lose. Redfield does have wonderful plugins both free and mainly paid for but many are worth it.
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The Redfield Plugins are an interesting and well-done set of Photoshop effects. If you like playing around with complex distortions (and don't mind the fussy interface) you can have a lot of fun.
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Love, love, LOVE it! The 'Seamless Workshop' and 'Water Ripples' are my favorite. If you're looking for a set of plugins that have nearly endless possibilities, get them. I've created some gorgeous stuff with these, and they never disappoint. Especially easy to use and sliders allow you some personal creativity.
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