I recently had a bad experience with Jayride, and I am posting to warn others.

About a day and a half in advance I booked an airport transfer with Jayride.com (JFK-EWR). The price was reasonable, and they offered a direct transfer with supershuttle. I received an email confirmation.

Arriving at JFK, I contacted supershuttle: they had no record of any reservation in my name, and the confirmation and order numbers from Jayride were not in their records.
I then tried to contact Jayride several times - nothing.... the "24-hour support" hotline was dead.
I booked my own transfer, and sent an angry mail to Jayride customer support. About a day later, I got this response:

G'day **** ,

Thanks for booking your airport transfer on Jayride.
Unfortunately, Supershuttle were unable to service your booking due to operational reasons.
.......
We are issuing a full refund for you right away, sorry about the inconvenience.

SO, thank you Jayride for refunding payment for services you failed to provide, BUT I had a confirmed booking for an airport transfer ! And Jayride (and supershuttle ?) knew about this - they had my details (US phone number, email) - ZERO communication. And finally, instead of admitting they screwed up, a laconic "well, these things happen" response.

So, BEWARE if you plan to use Jayride. If you do decide to book with them, double-check with them, and with the supplier, the day before.
Or best yet, book with a company that takes its business seriously.

D.