Great product for the money, easy to use
Bought this primarily for using with my 100mm macro lens (67mm diameter). Despite having only minimal experience of using an external flash, I found this product very easy to use with my Canon DSLR - the LCD display appears to be pretty self-explanatory. Without bothering to read the manual, I was immediately able to attach the flash to the camera, set up e-TTL (which seems to work as I would expect), adjust the balance between the two half rings, use flash exposure compensation etc. Very happy with the results. There are a couple of settings I haven't used yet, but I don't anticipate any problems.
When used on my 77mm diameter 24-105 lens at the wide end, I get a very distinct ring around my image (more than just a bit of vignetting). However, the product description did warn that this could be a problem, so I was only investigating and have no complaint - just a reminder for potential purchasers.
My only (very slight) niggle is that the battery compartment cover doesn't feel quite as robust as I would like. I think I will be extra careful when I put batteries in or out. Would definitely recommend this to anyone wanting to buy a ring flash without paying through the nose.
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