Has anyone ever made a drop-and-zip sailbag (i.e. stackpack, mackpack, sailpack) using the kit from Sailrite? How did it go?

I must admit the one thing I dread is putting the mainsail away. I have lazyjacks with a conventional sail-tie and buckle-down cover setup. I have uttered many profanities at the end of the sailing day. What's the scoop on the Stack-Pack or mainsail drop-bag (term?) setup? I've seen a few...