I have both the Maestro and GN.
ODS prefers the old style buckles of the GN b/c he can do and undo them himself. I like the higher weight on the GN (never know if you'll need it). I like the padding. I like the cubbies (under the cup holders). I like the width and sturdiness of it.
I like the Maestro little crotch buckle and the fact that it's easier to pull out from under YDS's butt--the same as the new style GN ones. ODS pulls them out himself. I LOVE the Sears fabric w/ the Onyx/Shadow mix on it. I like the price. AND, you caught the sale at Sears this week, right $80?
I don't like that the Maestro is so light weight and flimsy, it makes me wonder even though I've been told we don't know how they'll react in an accident. I don't like how close together the Maestro straps are by the neck and the fact that they don't have official harness covers.
For a spare seat, I *love* how light/flimsy the Maestro is. It makes it easy to carry, move, install and remove.
Think that's it! I'd say use the GN in your car and grab a Maestro for a spare. Or, demote the GN for for your spare and get a Frontier for your regular seat. I was planning on doing that and still kind of wish I had, but I'm a sucker for a sale and Onyx/Shadow! LOL
tam