For my entry, I present the Sigma 40F. I still own it, and will probably never get rid of it as I would lose my *** financially speaking. When they first came out, I had just discovered that my damaged right wrist would no longer allow me to shoot a .45ACP 1911 type semiauto (over time, I discovered that my wrist was "unlocking" under recoil, which caused "limp wristing", which lead to FTE.) At the time, I just had to own and carry the largest caliber handgun I could carry. Since it was no longer the .45ACP, and I wasn't going to carry no dang sissy 9mm, the .40S&W was the likely victim.
The local gun store had the new S&W Sigma, and it felt so good in my hands. Previously, I had tried very hard to like the Glock 19, but found it just didn't fit my hands very well. The salesman actually let me shoot the Sigma, and I decided I just had to have it.
As I recall, I paid dearly for the privilege - I believe brand new Sigmas can be had for about half of what I paid for a new one. But I learned the valuable lesson of the consequences of being an "early adopter". Now a days, I try to never buy the first generation of any new product. Let all of the bugs and shortcomings get discovered and worked out first, and I might be a buyer in its second or third generation offering.
I also hated the plastic rear sight that would slide from side-to-side in its dovetailed slot. I eventually bought a set of steel night sights for the Sigma to cure that problem. Still, it isn't really a bad handgun, I simply overpaid for the privilege and learned a pricey lesson.
Regards,
Dave