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I have them, but haven't ridden them yet. I can tell you that they're a weird sizing/fit for me.
The fingers are the right length, but pretty loose and baggy, the palm seems to be about right, and the gloves seem to be about the right length up to the wrist, but only trying them off the bike, the padded area of the palm is an unusual size/position. It's way to big to be supposed to just sit in the 'fold' across the palm, but too short to come down and provide padding for the heel of the palm which is what it feels like it should be doing. They make me feel like I just need to pull them on a bit more, sort of hitch them up an inch to get the padding in the right place.
Sanddancer-
From memory the thumb does slightly dig in, but not as noticeable as the merino gloves.
Bear in mind i probably don't do 3-4 hour rides in winter or when its that cold so it could become more of an issue of you do those sorts of rides.
I've also got Assos S_7 winter gloves and the PT gloves fit better, nicer feel using the bars/ shifters etc.
MicroDosed™
Anyone on here got the PT soft shell gloves? If so, is the seam on the thumb as uncomfortable as all the reviews make out?