I dont have any experience riding the IRO, but from what I've heard, a lot of people seem to like it. Also, the Kilo TT has lots of fans over here, just check the Kilo TT Thread. I also ride a Kilo so I'm biased. Yes, the geometry is track-ish and it may not be as comfy compared to say, a conversion, but its something that your body could eventually get used to. I've seen people do centuries on their Kilo. Goodluck!