I've got two pairs of the dHb bib-tights and have been wearing them in winter since 2006 (well, first pair was bought late 2006, second pair just after the summer 2007).
Never had a problem with feeling cold in them, regardless of the Scottish winter weather. I arrive at work hot & sweaty, as they really do feel too warm at times.
Are yours definitely the fleecy-lined ones ?
My only problem with the pad is that the stitching has gone in parts on both pairs - but atthe price I paid and the wear I've had out of them, I can't complain. I'm sure they'll last me many more winters too.