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Let down by the detail...
on 1 June 2014
Koolertron isn't a brand I'm familiar with, having seen it nowhere but Amazon. I'm not a brand snob but I was given pause when I realised the Koolertron name was on a tacky paper label that wasn't even put on straight.
The first bit of detail that lets it down is the degree scale around the base, not white on blue as shown here, but white on what might be brass (it might also be cadmium-plated steel - no way of knowing). What it quite definitely is, is almost illegible, white on brass-colour having insufficient contrast to show up clearly. The rotation is stiff and baulky, too. So stiff that rotating it anti-clockwise will unscrew it from the tripod no matter how tight it is.
For my intended use, that doesn't matter a lot - for anyone wanting to use that feature it could be a deal-breaker.
As for the rest of it, the implementation of the quick-release plate is best described as clunky and not that quick (the knob has to be unscrewed and the plate slid out - on every other q-r head I have the plate pops out when a lever is released).
The ball is smooth and locks up tightly, though I do have to ask why it needs two knobs to accomplish this - most ball heads manage with one, or a lever. Like the q-r plate, this just slows things down.
Note: It turns out that leaving one knob permanently loose works just fine - the other is more than adequate to lock up the ball on its own. Clearly, the second knob is superfluous.
So, OK, it works - but it could work a whole lot better.