I'm contemplating buying a W2 and wonder about the RF sensors: 1) When most operating is 100W or less, is the 0-2 kW coupler appreciably less sensitive than the 0-200 W coupler? 2) If the answer to (1) is yes and a 0-200W coupler is used, are there any coupler worries when operating the kpa500 at > 200W? Thanks, Mike ab3ap