there are clear differences especially in the quality of fit & finish between YN and "name-brand" gear
I'm interested. Please support that claim. I've seen these kinds of claims before, but have yet to see them actually quantified objectively, and I've asked.
Knowing full well that I will likely regret this... Using the TTL cables as one example: each end (the "male" end which attaches to the camera, and the female end which attaches to the flash) are small plastic cubes about 3/4" square (approximately). : On the genuine Nikon SC-29, the two injection molded halves which make up each cube fit very tightly, and flush. On the YN version, there's a gap, not huge but enough to catch a fingernail. On the Nikon cable, the male end is secured to the hot shoe with Nikon's standard "lever" lock; on the YN, it's a cheap thread plastic collar which clamps down on the top of the hot shoe. On the YN triggers I saw a fellow using recently (sorry, not sure of the model, new style, TTL-capable) the indicator LEDs were not quite aligned with the trigger body (as if an internal module was just a hair out of alignment). Of the two YN TTL cords I bought recently one works flawlessly, the other only about 60% of the time.