I use my Varios all the time and when traveling backing forth between home and weekend cabin typically add the BMW Vario liner bags. Haven't felt the urge to farkle them any further at this point.
I do disassemble and clean them a time or two a year depending on how much dust they see.
"Dang man I'm impressed." - Willy-B
"Are you OK? ... Are you sure you're OK?" - Honcho
"Disturbing and funny, all at the same time." - MrTwisty