Most people will not "need" a thin wrench set but if you do there isn't a lot of other options. I repaired CNC machines for a long time and I always found a need for them, I have a set of the Facom thin wrenches and the set is great, not cheap but they've served me well.
If you are a normal home shop person without a dedicated need I have to imagine the Duratech, Olsa, etc. would be plenty. If you find that you use them way more than you thought then pass them down to a kid and buy a fancy set. Isn't upgrading part of the GJ creed?