Same for me , the kick is a pleasure to use in the Legacy, extension or not, compared to many other mods. Granted, you do have to adjust the switch if you move from 18490 to 18650+extension , and it doesn't always discharge the batteries as low as in some other mods (usually at 3.66v the kick craves another battery to abuse) , but there's a lot of pluses with the legacy compared to some higher priced mods out there : durable and grippy finish, kick does not get mistreated when inserted or taken out, battery can be changed from bottom, easy access to clean and maintain the brass parts, slightly adjustable top contact, one of the strongest connectors, opening the top cap in a split second to adjust the wattage on the kick , etc.
Using mine right now with the kick and Drip Body on top.