Good decision, in my opinion. I got the 4" 69 first. I liked it a lot, but it has a problem stemming from my shooting style (I shoot with a VERY relaxed grip, and with relaxed and flexed elbows, which results in a very high muzzle rise ... almost vertical). The problem is that the during the recoil, the cylinder-stop unlocks, and the cylinder is free to rotate. I can see that from firing-pin scratches on the rear of the casing, coming up out of the primer crater, and arcing across the back of the casing. On the first 4 rounds, it doesn't cause any misfire, because the cylinder rotation is small. But when the 2nd to last round is fired, the cylinder rotates enough to re-lock with the last round lined up with the barrel. Then, when I cock the hammer, the first fired casing gets rotated into alignment with the barrel, and I get a "click" when I pull the trigger ... i.e., the last live round gets skipped. I think the only way to solve this problem is by S&W making the cylinder-stop out of titanium, instead of steel ... that would be light enough to prevent the inertial pull-down of the cylinder-stop that occurs with the heavier steel cylinder-stop.
Because of that problem, I bought a 5" 629, and that has been my everyday carry for about a year now. No unlocking problem with that gun at all, probably because it is quite a bit heavier and so the recoil isn't as abrupt as for the Model 69.