We have used them a couple of times from Ex-CCR - mucho convenient and way better experience than any mainline economy cabin. The price tends to be higher but you pay for convenience and time saved. I would not hesitate to use again.

Practice tip: if you book a minor make sure s/he has some form of government ID. My 14-yr old was almost IDBd at checkin at BUR because he only had a school ID. Of course this would not have been a problem at TSA checkpoint but there is no TSA at the JSX terminals.