I've seen several IRD 10-speed 11-34 cassettes, and they don't seem to be spaced right. Get the indexing dialed for the high end, and it's off on the low end. Get it dialed on the low end, and it's off on the high end. Different chains, different derailleurs, low-normal, top-normal, nothing really fixes the core issue: the spacing from cog to cog is wrong. So unless they fess up to a spacing problem and revise their design, I wouldn't bother with IRD's cassette if I were you.