I run triple coils at 4.5-4.7v on my ego booster. Works well, a little too hot to chain vape for me at 4.7v and 5v. Over the dual coils, I find it gives a barely noticeable boost to flavor with most juices and a decent boost for a small few (the dark desert ones mostly) but that's about it. TH is about the same at the same wattage. I've had mine for less than a week so not an experienced opinion.
If the price difference between triple and dual was less significant, I would recommended them. However, as it is, I kind of feel like its more of a extra you don't really need unless you want to spend the extra. That is, at the volatage I can vape at (I max out at 5v passthrough and 4.7v on the ego booster). However, I can't imagine at 6v the smoke being comfortable on a sensitive throat.