ePhotozine posted the full Meike 6.5mm MFT lens review:
The circular fisheye lens is a fairly specialised tool, the frame filling designs being much more prevalent and arguably more generally useful. However, who could argue with that f/2 aperture, with the quality of the results, with the excellent price, with the solid construction? The only difficulty is that judging manual focus is well nigh impossible, but the huge depth of field can cover most situations very well.
If we want to delve into the fisheye world at a reasonable cost and no compromise on quality, then this could well be a very strong contender.