I have seen other reviews of these which said much the same Andy - they seem to be reasonably good, certainly worth what they cost.
I wondered about one when I bought my 500mm, but after a trial with the manfrotto stirrup design head (which I still use for the spotting scope) in the end went for a heavy duty ball head, as I could use that for other types of photography as well. I have found that using the ball set at 90 degrees in the groove in the head, and with the panning lock undone, it functions very well as a 'gimbal'. It is considerably cheaper than a proper gimball from the big names, and has the advantage over the Indian gimballs that it can be used in general photography too.
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