The SD-E has a cleaner break, and of course the second stage is quite light. For HD, combat, or duty I can see it being too light except for a precision marksman rifle. The POF trigger was good, but the Geiselle is noticeable better. I can see using only SD-C and SD-E on ARs.
Also the flat trigger bow gives more tactile feel, compared to curved trigger bows.
I have the POF trigger for sale online for $100, but would sell to a Hide member for $85.