Its a pretty nice option to have. You can use it to seal stuff you don't want compressed in mason jars with
this attachment (& you'll need the hose):
I buy bulk packages of romaine lettuce, chop it all at once and put it in quart jars (with wide mouth lids--easier to get stuff in and out of). It more efficient to chop it all at once and I've had the lettuce stay green for 3+ weeks whereas it typically starts going bad after a few days.
Its great for salads in a rush. I need to experiment with other stuff. I've heard some people make a complete salad in a jar but I haven't tried that yet