I recently bought my girlfriend a Whistler XTR-335 with pop detection. I've been browsing on these forums for a while and everyone seems to run their RD with the POP mode off. I know that this if supposed to reduce the number of falses. People also seem to run with pop off to increase the detection range on their RD. Does anyone have an data to back up this claim or is this mere speculation? Does turning off pop really increase radar detection range? Also, would leaving pop on be more beneficial for states that use I/O K and KA or Q/T low power K or KA? I used her RD over the weekend in my car with POP mode on and POP mode off and I couldn't really see a difference in the number of falses or range differences.