My experience with Hero current production 10K nib had all been positive I would not say they are butter smooth but they are generally smooth with a bit of feedback and a slight cushioned type of bounciness ; personally I like the pencil sized ( literally same diameter as a standard hexagonal pencil ) H703 ( a copy of sort of the Cross Spire ) or the more traditional ( but heavily build ) H708
Hero H708, on Flickr
I appreciate that Hero is using the smaller nib from the H703 and the larger nib from the H708 on other pens of different sizes. I really enjoy the H703's nib because I can get some decent line variation out of it quite naturally while writing and it also lets inks shade nicely, but the body is just too thin for long long writing sessions. I believe the H706 has the same nib on a thicker body which would help.
Still, my favorite Chinese gold nib is the Lucky 14k because it can really do a decent job of flexing. I just wish it was smoother, but smoothness is not something Chinese pens are known for and shouldn't be expected.