Interestingly enough 39 magazines would not work in a 639 I owned for a short period, and 639 mags were impossible to find at the time. I rather liked the 59, never had a 659, but be sure to check magazine compatibility and availability.I never could like the Model 59, ergonomics just didn’t work for me. Loved the model 39 though.
The 459 has vastly improved ergonomics, trigger…well…everything. It’s a whole lot better than the 59 and not a bad shooter at all. The 3rd Gen S&W’s are brute strong, and very reliable. But finding magazines can sometimes be a challenge depending on which model you’re looking at.