I have the snowlife gxt mitten 3years (120days) now and am very happy with them. Ggood quality, durable, comfy and good adjustability. They come with removable upper and lower wrist guards. Catalog - SNOWLIFE
"Yeah... no, that's not clumsiness, that's just being topographically challenged" ~ Noreaster
I like the burton gore-tex mitts, good durability and you can always find them on sale. The Burtons use a removable glove linner for added warmth. I got my gf a pair of volcom gore-tex mittens a few season ago. They've held up really well and she rarely complains of cold hands now. Volcom uses an interesting split linner design to manage warmth, so depending on which side of the linner you put your hand, you get more, or less insulation.