It is totally subjective and no one can answer this question but you.
I have used the EdgeHD in 8" and found it far more pleasing to use than the standard SCT, but at that time, the price differential was not what it is today. Now I no longer have any interest in SCTs really, so I could not really say that I would pay the extra for the EdgeHD today because I think it is overpriced, but that is me but I would not have the standard SCT because I don't like the edge of field, so I would look for something other than either of these.
For someone that values having excellent off axis performance and would be bothered by the aberrations in the C11 (and I have owned one and yes, the field is aberrated at low power) then maybe the cost difference could be justified.
The off axis performace of the EdgeHD is superior to the off axis performace of the non EdgeHD. No one can really tell you if the price difference is worth the benefit. I would not own an EdgeHD 11 at the current price, but I would not want a standard C11 anymore having used the EdgeHD because the EdgeHD was way better off axis. Again, I don't really have much use for SCTs anymore, but I can tell you that having used both types, the EdgeHD is better. I can't tell you if it is that much better that it is worth the price being asked.
So, too subjective. You will get arguments each way, but in the end, the price difference is only worth it if you feel that it is imperative to have the benefits the design offers.
Edited by Eddgie, 03 May 2020 - 01:18 PM.