Just wanted to second recond4one's post. It would seem that the Chris Foleys of the world agree...
Got the JFK EA stamp, worked a bit. Unfortunately, we were a bit delayed in sending the AOS due to a missing marriage cert (takes longer in LA County) and I was still only out of employment authorization status for 14 days.
And this is for a Jan 2008 entry! Others obviously have better or worse experiences, but I am sick of those saying it ain't worth it. Don't listen to them, they are just projecting their own bad experiences or justifying their own decisions NOT to go through JFK. It will vary for each INDIVIDUAL. If someone got the EA and they didn't work or find work, does that make it not worth it for others?
Moreover, DHS/USCIS has plans to do away with the temp k1 EA entirely, so consider yourself lucky if you get the chance. You will gain experience in the labor market, meet people etc.
Good luck!
QUOTE(ready4ONE @ Apr 23 2008, 12:17 PM)

If he hopes to get a stamp he should enter through JFK. My [then] fiance did that, and got the stamp without asking. Once your fiance is here, it is fairly quick and easy to get a social security card, his will say right on it, can only work with permission of Department of Homeland Security [forget the exact language.]
My wife was able to find work within a few weeks of entry, and maintained employment throughout the AOS process without any issues. Of course you should not expect him to get hired for any sort of dream job until after AOS, since his conditional status will likely keep him eligible for lower end types of employment.
Good luck!