I have a pair of the Fusion gloves.
Make sure you buy a pair that fit. I ordered mine online not realizing Klim sizing is a bit on the small side (Large Hands).
If your warmers are slow to warm up in an extremely cold temps, the thin material will let your hands get cold and it may be difficult to recover finger circulation. I suppose that would be the same for most mechanics gloves also.
I like the design and quality and the switchable inside layer.
I just should have gone a size larger.