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I think @amey was just inviting me to come dump some thoughts about the Yepp.
In terms of child comfort, the rack mounted is definitely better as the seat is much further back. However the rack is fucking heavy and like @Verbs_&_Nouns says, the whole setup so you can use panniers and seat is a faff. I thought that if I was going to have a rear rack for the seat then I might as well make the weight more useful and fit the adapter to use panniers but it's so heavy already, I ditched the idea.
In terms of fitting the rack, for me on my small Surly Troll, the top arms weren't long enough so I had to join the long and short ones together. I don't understand how they would work on a bigger frame considering mine is tiny.
The biggest negative of the whole thing is that I just don't think it's a very good seat. Ezekiel always hangs forwards when he falls asleep, the seat doesn't lean back enough, I could rig it at an angle by leaning the rack back but then it'll look like I can't fit a rack level (slave to fashion). It's also not comfy or plush, it's very utilitarian. Fine if you're doing short trips, but if you're going to have your kid sitting on the back of the bike for a long trip, you could at least do them the favour of getting something a little nicer.
@NurseHolliday has detailed yepp review