I've been looking at some of the edges and and a few of them seem to be sort of worthwhile, and others do less than what might be expected.
As an example, my current character is kind of weak, so I got the strength of the ox edge, and it gave me a substantial increase to carry capacity. And then today, I was running a bit short on inventory space and had some RP points to spare, so I decided to get the well prepared edge. I paid 100 RP for +2 inventory items (increased from 44 items to 46), which is less than a 5% capacity increase (while strength of the ox was ~30% weight increase).
There are a lot of edges that seem like they could be interesting or cool or useful, but having to fork out up to 150 RP without knowing exactly what they do and then feeling like you spent a lot of time/effort for nothing just sucks. I just think it'd be a good idea if the edge helpfiles specifically stated what each edge does.
