Originally posted by beholder3 It (the JJC) does look more heavy and that again might suggest it's not fully supported by the flash but might rest on the lens.
Can you tell if it is light enough to stick out from the flash without bowing downwards and touching the lens?
Generally a closed tunnel type extender certainly look like a better solution.
Looks are deceiving..LOL it weighs only slightly more than the BB, about the same as an 8-10" lens attaching softbox, much less than a Rogue Flashbender or Grid. The way the box is designed coupled with the rear attachment design doesn't allow it to sag, similar but better I find than the BB, so it doesn't get any nearer to the lens . I use it with my AF540fgz's but prefer using these type of Flash attachments on My Sigma 610 Super since the flash head solidly locks in the different positions where as the 540 doesn't.
I use the BB now when I need to carry one for space saving compactness but I prefer the JJC overall but that is my preference using both. As a suggestion It would certainly pay to have both, they are inexpensive enough.