Do they work? In what respect?
I don't know. I just got them sewn up late last night. They haven't been in the rain yet, nor even the home shower.
As a kit, it seems decent. The fabric seems OK. Momentum 90 should be fairly rain resistant. However, I don't think that I would want fabric that is much lighter than this. Side zips work.
I suppose that if I were in Scotland or some god-forsaken place where it rains a lot, I would want something more substantial. However, I operate mostly in California in the summer. So, I need a little rain and wind protection.