I'm looking to move DD into a booster except for longer trips. She rides in a evenflo big kid as a spare but I'd like something with more support and probably latch. Her legs go to sleep in the evenflo due to the lack of support and padding. I'd also like something with head wings or more support on the sides. Latch is just because I dont want to have to remember to buckle it in when she's in kindy this fall. She's bigger for her age at 50lbs and 51 inches. Its a bonus if you know the booster works well in all seating positions of the Sienna.