The flex shooter works really well. I sold my gimble and just use my flexshooter 100% of the time...Its just easier to carry and fits into smaller spaces such as hides etc.... I don't know if a gimble might be better in any way , but if there is any difference its insignificant.....to me at least.
I would be happy using it with any camera / lens combinations including 600mm f4 etc... it can handle anything.
I highly recommend the quick release version....allowing me to quickly release and hand hold the camera if the action dictates.
View attachment 28243