Caution ... the RRS lever clamp is sensitive to the plate size. Not all RRS plates will work with the lever clamp. Some Kirk plates work, some don't. The knob screw type clamp will work with a much wider variation. If you buy new plates from RRS, phone them and ask if the plates you want to buy work with their lever clamps. Their advice isn't perfect but it's worth a phone call.
I've also had several instances of cameras slipping when I thought the knob was tight. The PhotoClam head I bought later has a larger rubber covered knob which so far I've never had the same problem with.
I second jeroldharter's comment that the Acratech is good especially if you care about weight. If I don't want to deal with the weight of the PhotoClam gear drive head, I use an Acratech.
Jeff Keller
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