I strongly believe they are. I spend a lot of time turkey hunting and drive quite a distance to get to my hunting grounds. If I fire two shells per season, that's a little less than $40 with the ammo I shoot. It's much cheaper than the gas I use to get to and from my hunts, cheaper than the calls and camo...basically I see it as a nominal expense, even when the cost per shot is quite high.
I hunt public land almost exclusively for turkeys, and most of it is quite pressured. While I tremendously enjoy working a bird in close and shooting him at 15 yards, that's not always possible. Shooting TSS has, without a doubt, caused me to have successful seasons whereas normal turkey ammo would have seen me with unfilled tags. Two years ago I harvested a large tom at 65 yards. He was hung up and would not come closer. As he turned to leave (his companion tom had just left), I shot him and he dropped instantly, dead. I marked the tree I was sitting against and the spot where he died and returned later with a 200' steel tape. The shot was exactly 65 yards.
Last year I had a tom that would not come in. He'd gobble constantly and had some interest for quite a while. Eventually he left, but for whatever reason continued to gobble every few steps, even when I stopped calling. He was leaving at a good trot and I had a good idea what route he was taking. I took off running and did a large loop and got to where I expected him to travel by. He didn't read the script and ended up passing by much farther away than I thought he would. I took the shot and he dropped immediately, dead. Again I marked my tree and the spot he dropped, and returned later with a steel tape. Exactly 60 yards. This was toward the end of the season. Without TSS I'd have not filled that tag.
Calling them in close is a lot of what turkey hunting is about, but being able to confidently take the farther shots when the situation calls for it is really nice. These ranges are only possible with TSS. I personally like the Apex TSS shells.