Personally, I find the whole process laughable, because some of the best "instructors" I've ever met have never held a CFI ticket in their lives. I don't have a CFI ticket, never got it starting out, and now, there's no way in hell I'd put myself through the stress of doing that ride with a 4-10hr oral for something that may or may not be all that useful for me in the long run. The sort of in depth and asinine questioning followed by a bogus flight with "gotchas" is something I watched many buddies go through - and the difficulty had nothing to do with PTS, rather it was dependent on the examiner, and whether or not said examiner had a burr up his or her ass.
I was signed off for my CFI, and my plane broke a few days before the ride, and wouldn't be up - it was the only complex airplane that was available on such short notice on the field, so I told him I'd call him to reschedule. The examiner bitched me out for not having my "stuff" together - basically telling me that I was going to fail - and a day later I got a job, so I said screw it, and never did the ride. In retrospect, it was a mixed bag. Not having the CFI made things harder, for sure starting out, and I'll get it "one day," but the process by which the rating is obtained is laughable at best. You sit in a room for 4-10hrs, then you go out and fly around in the right seat (which you probably only have a dozen hours in) doing maneuvers which looking back have little practical application to much of what you do "at work" so that you - a 300hr pilot - can teach other pilots how to fly. No, CFI mins should be ATP mins, and the checkride should be like checkairman authority (where you get an "applicant" and have a fed watch you instruct/give a checkride). But whatever, I don't really have a dog in that fight anymore.