I have yet to see a set of Ladybirds or any of SimonKobeJapan products, but if I've spent plenty of time drooling over all the great close-up pictures he has of his products. I've not seen better quality workmanship anywere like that! Certainly not Black Dragons.
But on their own merit, in my short ownership of them, there fine for the street and the price. I just uploaded some pictures of the bike with the BlackDragons in my gallery. I've been running this set for the last 6 months or so. They cost me $925 shipped. I got to choose from 3 different lengths, inlets, outlets, and midpipes.
My set is Carbon Fiber (not crazy about the loose weave), Ti inlet, ceramic coated midpipes, and apparently chrome outlet. Came with all the clamps and 2 hanger straps. They sound similiar to Yoshi's, just louder and deeper tone.
There are two things that do bug me about this system. First is that there is no tab welded to the midpipe to accomadate the rearset bracket. And there is only one spring holding the can to the midpipe. That makes for a shakey system, after awhile will rattle and wiggle around a lot.
All in all, I'd rate these Black Dragons about 7 out of 10. Yoshimura exhaust by comparison - my previous rs3's - build quality was just a little better.
Ladybirds are 10+
link to my gallery
, a few more pictures of the BD's, and the last picture is my previous Yosh's.