Picked up the Houdini after years of looking at it and I was not disappointed.
The fit aligns with all of my other Patagonia products. At 5'8" 190-200 lbs I use the large. Its a bit baggie and on "slim" days I might be able to fit in a medium but, the large allows me to layer with a puffy underneath.
It had to be the windiest day in Moab when I first wore the jacket. Could obviously feel the wind whipping the jacket but, not on my skin. Kept me warm and when I was running around it breathed well.
Last week I wore it during a rain/hail storm. It was pouring out and I did get a little wet around the collar/waist/sleeves as those are where the big holes are on this jacket. When I removed the jacket my shoulders/chest felt a little damp but, certainly not wet, I imagine another hour spent out there would have been more moisture seeping through. If you need a burlier jacket that blocks weather better look at the Alpine Houdini, the fully taped version of this. Its not meant to keep you completely dry during a full on rain storm but, I think its more than just a windbreaker.
Using it in the field is awesome mainly because of how light and how compressible it is. The fact that it comes with a built in stow pocket is a huge feature for me as I dont want to carry around extra nick nacks like that. Patagonia even put some thought into the shape of the stuff sack, so that it doesnt interfere with your climbing gear as much if its hanging on your harness, a place where you will commonly find this jacket. I pretty much bring it on any multi pitch climb now because its so easy and functional in the event of a chill or wind. If its raining and I am climbing I am heading down the route, or turning around at the base!
I will say that the hood fits over my climbing helmet but, on more robust heavier jackets I do like that the hood goes over the front of the helmet putting the precipitation away from my face. Again this is solved with the Alpine Houdini that has a more compatible hood for climbing helmets. Over my bike helmet this thing is perfect!
A few weeks back I did use it skiing. I layered it over my Nano Air. It was in the upper 30's and it was all I needed, in those temps I am leaving my bigger, burlier jacket at home now. Thinking about trying something like the Alpine Houdini as a full time ski shell but, that's next year!
Light, compressible, and very versatile is how I would describe this piece from Patagonia.
Let me know if you have any questions on this product or want to go over your layering system.