I've had a pair of the ones in the original post and they were great but I've found better.
I've had a set of these that I bought from my local Matco distributor for about 4 years now and they are awesome. I can strip 3 wires at a time quickly and consistently with these and they've also got a cutter in the handle. They automatically adjust to wire size and NEVER cut the strands inside. I've seen them as cheap as 10 bucks online.
As a testament to their durability please note that I use these almost daily and they still work as good as when I bought them.
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