I took two pairs on the TCR and wore them for a few big long training rides running up to it. Would recommend. Prefer the fit over the Brevet range - the straps on the PT range are a bit more elastic than the Brevet ones, which suits my body length better.
Echo @andyp's statement about the merino baselayers - I have a few in long and shortsleeve variants and they get a lot of use. As long you wash em at a low temperature and avoid mixing them with Velcro bits in the wash, they'll last really well.