One of my favourites. Killer warranty as well! I have used rain gear/pants/base layers/gloves/hats/dry bags and other gear from them. I have not used their cold weather gear at all, but some of their gloves are popular for Everest climbs, so they can't be too shabby. Their performance trucker hat is probably my favourite hat of all time.
Downside if i had to name a few would be I put holes in their ultralight dry bags (they really are ultralight and not meant for abuse). So even though I was not using them as they were intended to be used, they offered me replacement bags or put that value towards other pieces of their gear. Additionally, I love the ferrosi pants as an early season option, but they do pill pretty badly and stretch out over time. I also think their verglas gaiters are pretty poorly designed - but their croc gaiters are some of the best.