Okay, I'll give a somewhat negative report, bash me all ya want. I had a Security Six with a 4", my first center fire handgun. It was okay, but not a great gun IMHO. Accuracy with .38 loads was a little wanting, but it fired 140 grain Speer magnums quite well. Also, it was a little weird in that it not only required an elevation change, but a rather large windage change to shoot .38s vs .357s. Never quite figured that one out, only .357 I've ever had that was this odd between load sight ins. It was a rugged piece, but about 6K hot .357s and it started getting pretty loose. I traded it off for a Blackhawk that shoots much better and is a stronger gun. I don't worry about hot load round count in the Blackhawk and it shoots .38s well, so I don't feed it that many magnum loads anyway. It's an outdoor gun, not a concealment gun, though. The Security Six was an outdoor carry. I couldn't legally carry it, though I did illegally carry it in my truck on trips. Texas law was a little strange about "traveling" back then. I've vastly improved that niche with a Taurus M66 4" that is target grade accurate with either .357 or .38 loads and is a tough gun, though the Ruger's design appeals to me for strength. I don't feed that Taurus a steady diet of hot stuff, learned my lesson. LOL I mean, if the Security Six got loose, well..... That Taurus, though, will shoot the eye out of a rabbit at 50 yards, amazingly accurate gun, a great outdoor carry, by far the most accurate 4" .357 medium frame gun I've owned to date, which would include a Smith M19 and a Rossi 971. But, a 2.75" Speed Six would be a nice carry. Personally, though, I had a SP101 and I think it's a much better built gun. JMHO, but I'm not a Security Six Koolaid drinker. It may be 1 round less capacity, but the SP101 carries easier on the hip, has a better grip design, has an improved lock up, is a stronger gun period. If an extra round means that much to ya, you probably need an auto.
That said, I'd like to get a deal on another Security Six. I liked the gun, really. It just didn't do exactly everything I wanted of it and it wasn't as strong as rumor has it. I don't really miss it. I do sorta miss the SP101 and am thinking about getting another, this time a 3" version. That was a sweet gun. But, if I stumbled on a Speed Six/Service Six for that money, well.......