70-200 F2.8 non is and any type of Canon teleconverter

Does anyone have eny experience of using the 70-200 F2.8 non IS and either a 1.4 or 2x canon teleconverter?
I am interested in anyones thoughts - experiences?
Thx. P.

Well, it is ok with EF 1.4x II. With 2x TC, it might be too soft for someone.

Would anyone have any examples of both, that they could post?

You can compare image quality here:
http://www.the-digital-picture.com …omp=0&FLIComp=0​&APIComp=0

Thanks for the link Owl, took a bit of fiddling to work it out, but it made sense.
Obviously the 2x is very soft at the wide end but F8, onwards seemed ok to me. I don't have brilliant eyesight so I am slightly challenged. I could see one or other teleconverter might be a stopgap until I had the moeny for a fixed longer lens. R.