I purchased the 488RC2 and returned it the next day. It seems to have an lots of fans here but I found that it drifted significantly with a 5D and 24-105 - even in landscape. I tried two more in the store and they did the same thing. I now have the RRS BH-55 and couldn't be happier. It locks down tight and doesn't drift at all with a 70-200 f/2.8 IS or 300 f/2.8 IS.