I use these things while riding between 28-40 degrees (below 30 is pushing it).  For mountain biking these temperatures are acceptable, but i'm not sure they would make it below 40 degrees at higher speeds on the road.  Just as most other Gore products, they are constructed very well of high quality material.  The padding on the palms holds up better than expected and prevents any numbness of the hands.  They block light rain, sleet, and the wind flawlessly.  The cuff at the wrist is quite narrow making it a pain to squeeze into this pair of gloves, but it keeps virtually all wind and moisture from getting down to your hands.  I find these gloves to fit pretty snug, so if you are between sizes you may want to go a size larger.  I have pretty good dexterity while wearing these and can flex my hands around to make adjustments to my bike or use zippers on my camelbak.  It would be nice if Gore had put some grip on the index fingers to assist in grabbing things.  On that note, the grip on the palm padding is intense and gives a good sense of security on an icy descent.

Overall good gloves, just a little pricey..