If you plan on using your pressure bleeder very often, I suggest the one
with the swivel in the hose between the MC cap and the pressure tank.
Otherwise, you have to juggle the tank as you thread on the cap, to avoid
kinking the tubing between the two.  So on a Vanagon, where your primary
brake fluid reservoir is right above the dash and the interior, you will be
likely to spill, eventually, or what happens to me is I take the cap off and
it 'winds up" the tubing...then I forget and let go of the cap, filinging
drops of brake fluid all over...Eventually, that connecting hose gets tired
and breaks, too.  I have the simple one and I wish I'd known there was one
with a swivel...Every turn of that reservoir cap demands a turn of the
pressure vessel...A lot to deal with inside a car, above the electrics,
interior paint and upholstery..Somewhat possible to "pre-wind" the hose
before you start the cap onto the res...but kinda awkward and dumb..
  Don Hanson