Overbuilt. In fact I and many others find it too overbuilt for EDC. The sebenza is a workhorse, but does not stand well to super hard abuse (think prying and just trying to baton/destroy things with it). The Hinder excels at this. But to do so requires a much thicker, much larger blade, thicker handles, and with the choil you don't actually get a larger cutting edge either.
There is no perfect knife for everything. You should get one and try it...but if you EDC a knife and use it primarily for cutting, the thick blade stock is likely to disappoint you. The sebenza fits best for me (light to medium EDC with more cutting and no prying), which is why I own a dozen of them. The Hinderer will cut rope and a bunch of other things just fine, but when you start to try to slice food you are going to dislike the thick blade stock and the sebenza will really excel in cutting where the Hinderer physically cannot. You can however really just have at it on things like a 2x4 with the Hinderer (especially the spanto grind) and it is extremely unlikely the blade will fail you.
Besides that its got great fit and finish and will last a life time. You know it is a good knife if the first people to get them are FF/LEO/EMT/MIL... you just need to decide what you are looking for in a knife and what you are going to use it for.
I think the 25 is a bit beefier than the 21, so it is actually kind of bridging the gap between the sebenza and xm.