I thought Sealskinz were awful. As mentioned, the liner feels very loose and with the pair I had, the thumb liner had been sewn too short so didn't fit well. I took them back to swap them and all the size mediums had the same thumb sewn too short (I don't have odd thumbs!). The LBS guy (guess which one in Sheffield…) was indifferent saying "Yeah thats how they're made and it happens sometimes". Sometimes… on every pair you have in the shop?
I have 661 Storms. They're good as long as it doesn't piss down for extended periods. I just don't like lined gloves for riding so try and get away with heavy duty summer gloves as much as possible.