Depends on how many are in your group. I used the Mears shuttle a year ago and found it to be just fine..but if you have more than two in the party and you want groceries, it may be more cost efficient to book a car service.
Mears runs about $32 pp, r/t, but doesn't stop for groceries..obviously. You can use a grocery delivery service for about $12 charge, plus any tip. I have used both gardengrocer.com and wegoshop.com...both with good results.
Or..you can book a car service for about $100 r/t, or $60 one way, plus tip, but you should be able to get that free grocery stop with the r/t fare, and perhaps with the one way fare.
This is how it would break down...for two people in the group..
Mears...$64 fare, plus a $10 or so tip. Then cost of groceries, plus a $12 delivery charge and $8 tip...total about $85.
A car service....R/T would be about $100, plus a $20 tip..total $120ish.
Up to you.