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Just as long as you stick to RRS plates the lever clamps are great. However if you use plates from other manufacturers that are slightly smaller or larger, they won't lock down well in a lever clamp and a screw clamp is a better choice.
I use a variety of RRS, Hejnar, and Wimberley plates with my RRS lever clamps - they work just fine. I also use RRS screw clamps, especially for stuff I want to slide around, like a macro focus rail, for example.