I think a lot of it will depend on what you did with that 8 or 10 and out. I have two friends right now that went the 8 or 10 and out route but in that extra time, did nothing to advance their careers. No degrees, no advanced quals, no special duty, no nothing. So they are getting the following question at their interviews;
"So why didn't you qualify EWS with all of this extra time?"
Ouch, not a question I would want. So far, they are still looking. Not that I don't think they will get hired, but at the place they asked that question, they will not.
I think if you are going to stay 8 or 10 and out you need to do something productive with the time. That time should be spent resume building so that you can hire into a higher position than if you had done 6 and out. In my opinion, unless by choice, if you got hired into the same position as a 6 and outter with 10 years in, you are doing something wrong.
Justin