For the record I posed a similar thred to this a couple of years ago.
When I built my SS last year I decided to fit a silver Thomson stem and post almost totally for the looks. Which is fine. In use I would have said they both felt solid and chunky. I would have liked a bit more flex in the seat post, but it was an advantage on the stem. They look nice, they work well, but the stem clamp is pointless IMO. If you want a smooth steerer clamp, go look at an old Race Face System stem to see how it should be done. Oddly I also found the saddle clamp a bit fiddly, but that could have been me.
Best thing about them? I bought them used, and sold them for the same price I bought them for.
It's good kit, no doubt about it, but functionally not worth paying the premium price for. The OE stem on my Pitch is just as good……