Today on my shift the first day of XJet in BOS was fairly smooth considering the lack of time our station had to prepare for the operation. We utilize gate 33 which is our overflow gate. We typically have two "wingtip" flights depart 25 mins apart from each other. Our first flight to IAD left ontime at 1820. The other flight left 40 mins late due to MX in IAD earlier. The aircraft I hopped on for a second had no XM

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Here's a photo:
http://i17.tinypic.com/2e1a8fq.jpg
Overall I think the operation in the customer's eye is minimal. Although it is a significant downgrade in a/c and services, the airfare that is commonly purchased on these flights, the $25 voucher, and the relatively short duration of the flight >hopefully< make up for it.
Happy Travels.
Please be advised I am posting this on personal behalf, this is not an official posting from JetBlue.