Thor's hammer
The 645 was the second auto pistol I ever owned. I fired many, many many THOUSANDS of rounds through mine and it never jammed. Unfortunately it was heavy as a brick and very difficult to find holsters and magazines for it. When the 4506 came out sources for grips dried up. I had to hog out the corner on a used Pachmayer to get it to function without interfering with the safety. It was reliable, durable and safe. But it was heavy, loosely fitted and very innacurate. Honestly though, there are some times when I wish I had kept it. It certainly is a better gun than say, the .40 cal USP I now have that took its place in my battery as my only DA big bore, and it is more reliable than the Colt Combat Commander that I traded it in for.
To be honest, its a good gun. I would buy it if I were you. It may not be trendy or sexy like some other makes, but it is sturdy. Kinda like the Thor's Hammer of semiautomatics. It never fails.