We have a Young Style and love it. It was oldest dd's booster when she first started using one for backup in dh's car, and now dd 2 just recently started being allowed to ride in it in dh's car. DD 2 is too small to look good in the Monterey to me--the YS is much nicer for a smaller child. It doesn't last as long as others, though--dd1 has recently really outgrown it. It may technically still fit her on the highest setting, but she looks way too big for it when she sits in it. She's not that big, either (I haven't measured her in awhile, so can't give stats). DD2 I think was around 48lbs and 48" last time I measured (do those sound like normal measurements?? I could be totally wrong, lol).
I tried a Young Sport for oldest dd years ago, and it was too tight and narrow a fit for her at the time. She was probably around 5. She's not a really narrow child, though, just a little smaller than average, but a sturdy build.