I'm only going to evaluate companies that I have owned knives from. I've handled Microtech, Reeve, etc, but that's not a fair rating. SO - Rated from worst to best:
Cold Steel: When a company decideds to trade quality for profits, it's a one way trip. The original Cold Steel knives were great knives. I wouldn't have a new one now as a gift. :grumpy:
Emerson: The other offender in the reduced quality game. I have an old emerson folder that I would use for *everything*. The new ones are a dissappointment in comparison.
SOG: Not bad, not great either. Good user knives for chores, etc. around the house. Not EDC quality IMO.
CRKT: Pretty good quality for the money, really wish they had a better range of steels for some of the designs.
Kershaw: Only owned the Leek, neat little design, very slippery. Good quality, holds it's edge well. Haven't had to deal with customer service, so no idea.
Boker: Good knife, but the one I have (Titan 1) I think of as an art piece rather than a user. Still good for "Oohs" from girls, though.
Victorinox: Got an old Champion, I have beaten the crap out of it for 20 years and it's still good. What more can you ask for?
Spyderco: Disclaimer: I live less than 20 miles from the Spyderco factory. I don't know how many different Spydies I have owned (30?)...I go to the outlet sales and drop $300-500, give them away as gifts. Great customer service, knowledgable staff, Sal (the owner) likes talking to his customers - I'm still nagging him about bringing back the G-10 Standard model, and he's still listening patiently. Spyderco has something for EVERYBODY; I defy any knife guy/gal to not find something to like in their lineup.
(It's AMAZING how much a girl likes getting a good quality knife from a guy, as long as it's something easy to carry and compliments her - i.e, NOT chunky like a salsa, but slim, useable and attractive. Yes, she bases your opinion of her based on your gifts to her.)
Benchmade: Tied with Spyderco at the top of the production charts. I go back and forth between these two, based on their new designs...my beater EDC's are all Spyderco and Benchmade models. Customer service great for me, but hear they are horrid for dealers.