Agree with you on the ERS4's & don't like the Churchills. They are what I have been wearing since Redley's stopped being manufactured. ERS4's are identical to old Redley's. Most comfortable & great response & float in salt water. Viper V5 & V7 fins are good for quick bursts of speed but can wear on ankle joints after a while. They are a narrow fin & find that they cause more cramps on the side of your feet which SUCK!! Mike Stewart Vipers are more comfortable than V5's & 7's.