I went to the Transam event at Park City Saturday with Sam. I shot practice and then brought out the flashes when the sun set behind the mountain. I tried using them at the Wyoming rail, but only 1 of 4 pocket wizards were working. Someone suggested putting hand warmers on them to keep the batteries from getting too cold. I tried this that night while shooting the jam and they seemed to work fine (though it wasn't nearly as cold).

Check out the rest of the shots in the Park City Transam gallery.