Hello, having owned and used Klien tools over the years I thought I'd add my opinion.
What is excellent from Klien are their Linemans pliers, needle nose pliers, diagonal cutters, nutdrivers, and wire splitters.
As far as the newer made Klein screwdrivers are concerned, lets just say about the only thing on them I still like are the sure grip rubber wrapped handles, the quality of steel being used lately has gone way down hill. I can't believe their screwdrivers are still considered a professional grade tool. I've had to file or re-grind more Klein tips within the last 5 years than any other reputable brand screwdriver. The steel used in the tips, particularly the philips tips are too soft to hold up to daily use. They just wear and damage to easily. If they do cam out, the tip is usually ruined the first time. Even worse, the 5-in-1 and 10-in-1 screwdriver tips are made of the softest steel I've ever seen.
I find the basic Craftsman screwdriver tips to be pretty strong and much more durable. If cam-out occures the Craftsman drivers tend to ruin the fastener head with barely minimal damage if any to the screwdriver tip. If Klein want to justify the price they charge for their screwdrivers then they need to invest in better heat treating and tempering of their steel. I come across a lot of electricians and while a lot of them do have Klein screwdrivers in their tool belt I also notice that a whole lot of them tend to have a mix of Klein, Craftsman, and I see lot's of Stanleys too.
As far as pliers are concerened, especially tonge & groove pliers, I regard Channellock as top of the line. Another great benefit is that they are still the most reasonably priced too.