Just bought one last week, actually. I'm comfortable using it.
Very neat seat, btw. THanks Julie for mentioning it to me. What is also neat about it is that it can be used quite easily for any FF child that meets the requirements, simply becasue all of the adjusting is right there in front. It fit in that deep bucket seat when nothing else would. My DS(2 yrs. 5 mo.) likes it ok, although he really doesn't appear to be very comfortable in it.
I like that the weight limit is higher, as well.
I did find that I did not get a tight install(not even close) with a seatbelt. I have only tried it in this one vehicle, and when I get a chance, will try it in my car to see if I get a different result. So, if you don't have lower anchors, it might not work. It must also be used with the top tether anchors if in harness mode, which could be an issue for some folks. It was a super easy install with LATCH, though.
It's not a primary seat for us, and I don't know how well I would like it for travel--but I am used to traveling with my MA, which I can use on a plane. A bit pricey as well, but again, it fit a deep bucket seat very well, and was short enough to go under the headrest, which was an issue for us, and could be for others.