I have a bubba moe - and found that in the front carry- my newborn HATED it because she hated to lie down (reflux) and she is a long baby so was kinda squished in there.

And it pulled on my shoulder and she wasn't particularly heavy either.
Personally I love the BubbaMoe and so does the little guy. I guess it's horses for courses though, because Mr. J is 4 weeks old, 56cm (reasonably big I'm told) and has reflux. I think little guy loves the squish.

I've put him in an Eden Meitai (sp?) once and he screamed his head off. I'll try again, but maybe once he has more head control. One thing about the BubbaMoe is that it can be lifted off and on very easily. I swapped him from me to DP without waking him. Also, when he wakes and starts to grizzle, we just lift it off and lay it down on a flat surface and he's quiet for the next 5 minutes while he adjusts to stretching out. Perfect for that quick window to prepare for a feed.