I discovered these just in time... at the bottom of the price market.
I've read these were $700+ guns when they were new, so by today's standards that would be some $1000+ new!
They recently (last decade) flooded the used markets having been overtaken by the plastic fantastic models... and you could buy them for $300-$400...
Any of the 3 or 4 digit models are awesome. I've only run into one that didn't suit me, a 469 that I simple could not shoot straight or get a good grip on. Other than that, I've found the 5906, 6906, 457, 4516, 4006, 4046, 4003, etc. are just well-made, solid and awesome pistols!
Prices are still low-ish, but climbing.