I am not sure if I got a good one and others didn't, but I am runing a Yoshi R77 with the killa removed and K&N air filter and don't have any running issues.
I have 4500 miles on mine, a lot of city but some highway and twisties and my bike runs like silk. There is a small, very small hiccup in the midrange but in all honesty, I dont notice it in any gear but first and even then it is so small, its not worth the big hassle and $$$ to get rid of it.
I am no stranger to either product, or others similar, my previous 3 bikes, 03 Kawi z1000, 97 TL1000s and Bandit 12, all benefited greatly from a dyno jet and/or re-map. I just don't think the 8's problem is big enough to warrant it.
When I ride hard, I shift above the flat spot once I'm into 2nd. When I ride in town, I shift right at it. I just don't feel the need to plunk down a shit ton of wonga for minimal hp gain and a prettier dyno graph.
Just my humble, opinionated opinion though