update after using the hoodie
pros - looks nice (olive), feels nice (pajama like softness), and the hood and thumb holes are a nice feature to add a little warmth especially in a situation like cold weather camping
cons - the weave of the fabric doesn't have much loft or fuzziness to it. At 300 weight fabric I'm expecting maximum warmth since its basically the heaviest weight wool offered by common outdoor brands and I think they could improve upon the insulation factor at that weight. Also the hood has a slightly funny shape to it but its still fine.
fit - I'm between a medium and large in most brands (6' 170# 33" waist 42" chest) and often have to size up to large because of the chest size. The medium had a nice slim fit, I tried the large too and I was swimming in it, so I went with the Medium (customer service and exchanges are super easy).
Comparison - The OP asked about this in comparison with a synthetic fleece. In my opinion its tough to compare the two because they each have their own place, with wool being the ideal base layer and a synthetic fleece being the choice mid-layer. For the most modular and breathable cold-weather setup I'd wear the wool base, fleece mid, and an uninsulated shell. For casual cold weather use I'd wear this hoodie by itself or over a tshirt with an insulated jacket as the outer layer.
Keep in mind merino wool is more fragile and can pill, pull, run, and rip easier, but it also feels soft and light even when damp and dirty, its naturally odor resistant, stain resistant, and fire retardant. Synthetic fleece will likely be more durable and lighter weight but may not feel as soft, especially once dirty, it will hold odor stronger and sooner, and an ember from a fire will melt a hole through it in an instant.