Priority access. That is main. Comfort is anyway the part of heavy price you pay. Sometimes when you are late or you have to leave early ( for connecting flights) priority plays a key role.

While travelling it is sure commercial travellers pay more to avail more facility but always not possible and other travellers also feel uncomfortable and need solution. As airline receive fees and cost should take care to provide adequate service.

Before the take off: have the opportunity to arrive at the airport later than economy travellers, priority access to the customer service without having long queues
During the flight: bigger and better seats, onboard lounge and bar (probably available just on long flights), fine dining and top service, entertainment (bigger screen)
Finally landed: priority baggage collection.

the main difference being:
flat bed, being able to get a "good" rest, so that you need little recovery after a flight.
after long flight getting out of an eco-chair and try to work the same day is a challange, after same flight on a BC seat with full flat and ability to sleep, it is much more duable to get some work done.

Quick access to the airplain.
Comfortable seat to rest and enogth room to work with computer etc.

There are premium Check-in's services.
For exp:
http://www.iaa.gov.il/en-US/airports/bengurion/airlines/Pages/premiumcheckin.aspx

Priority access (that is a given), being able to work quietly in a relatively distraction-free environment, 40 winks of Zzzzz, and the ability to get a shower before starting the day. Oh, and a cup of joe, or two.

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