Jeff,

I'll go with the stackpac but you can have my share of the "Dutchman"
They let the sail go up and down OK but other than that they're a PITA.
Sailcovers, boom position, lines in the sail trim, etc.

My Lazy Jack pull up to the mast and the boom when sails are trimmed.
They take a Std Sailcover and can be in place in an ease condition in
biulding wind to make reefing easy

Over all, I think a well thought out 'Jack System is pretty hard to
beat.

OT