Not exactly the one's you're looking at, but I have a pair of neoprene gloves, which are awful as they are uncomfortable and are extremely slippy on anything stainless steel. I also have a pair of Gill Helmsman's gloves which sound similar to the Gull ones... they're lovely when you first put them on, but once they get wet they are horrible... the leather palms soak up water, the stitching leaks the water into the gloves and the lining soaks it up. Your hands become very cold and very heavy!
Best solution I've found so far is washing up gloves - they are 100% waterproof and 100% windproof, and you can grip stuff easily. Hunt out the ones in blue