I got mine for $120, less than the Nautilus usually is. I like it okay. I used it today because my usual seats are out being cleaned. It takes up quite a bit of space compared to my Radians, but that's not an issue if you only have one. More of an issue are the installation without LATCH (blech!), requiring a top tether in any car it's used in, not having a shell (makes me a bit nervous if not using it for occasional use), being outgrown when there is no vehicle head support rather than when shell is outgrown (since it doesn't have one!), meaning that in many cars it would HAVE to be outboard even if you could manage to get it in the center even if you don't have LATCH in the center... There's just a lot of issues that mean I wouldn't like it for everyday use. Also it doesn't become a high-backed booster, only backless, and I don't think my kids would be ready for a backless when it's outgrown with the harness. I don't think that it will get them anywhere near 60 lbs., it will be outgrown by height long before that.
That said, there are things I like about it. It's pretty lightweight; my oldest daughter loved riding in it (although my 3 year old didn't seem to like it much; I think she was put off by the lack of shell, she's used to and comfortable with her seat.) I have the red and the color is gorgeous. Overall, for the price I got it for, not a bad seat at all, and I think it's very cool. It's fun to play with and would be a great travel seat (for families with one or even 2 kids.) But, for everyday use? Wouldn't do it. Not unless I had LATCH and a headrest (or very tall seat back) in the center and could use it there.