Why don't you just ask the real question? There must be a real question - you're surely not just wanting to write a thesis about this lens. You did exactly the same thing on the other thread about teleconverters, but if nobody knows what you actually want to know then it's just a waste of everybody's time.
Reading between the lines in your two threads, I'm guessing that you have some sort of 70-300ish lens but you want a bit more reach, and you're wondering whether a teleconverter or a different lens would be better. Is that right? If so it would help if you could let us know what camera you have, what you want to shoot, what your budget is, whether you care about shooting handheld or tripod, etc. Then people can give you targeted information which will actually help you decide.