I tried the Blum undermount for a drawer that I had planes in. It was nice, but expensive.
I am now thinking it would be nice to use the KV undermounts on my desk that I am making.
They seem nice too but I noticed that both the blum and kv drill jigs are way over priced . What the hell... a piece of plastic with some steel inserts for 50 to 100 bucks ..
If you want to sell many slides why would you overprice the jig? wouldn't you reasonably price the jig? And have many good installations, so the product shines?