I haven't tried it personally, but I was not interested in the FFO position - in my experience, by the time a baby has enough head/neck/trunk support, they can go onto your back, which is more ergonomic for the wearer.
There are a few schools of thought about whether the narrower base carriers can be harmful for babies with tendencies to hip displasia, so you may hear about that, too. I personally would limit time spent in a narrow-based carrier, but my family is prone to hip issues (my mother had her hip replaced last year and she'll only be 60 in October) so I was fairly cautious.
Here's an explanation to help you clarify what I mean:
http://blog.quirkybaby.com/tag/baby-...hip-dysplasia/
We registered for a lot of high-end stuff, too, and the only person who felt badly about it was my DH. People have budgeted to give you a nice gift, so don't let the price-tags scare you! (Also, most registries also offer a completion discount which may bring a more expensive carrier into reachable range.)
I would recommend the LilleBaby Complete as an alternative, since it does all the things the Infantino does, but is a bit better quality with a wider range of body types that work with it; several vendors online sell them, but I always recommend QuirkyBaby because I've met the owners and learned from them:
http://www.quirkybaby.com
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Liz
DD (3/2010)
"Make mistakes! Get messy!" - Miss Frizzle