We recently bought the Graco Slim Fit for DD2 since our other convertibles were expiring, and I really like it. She is nearly 4 but already forward facing. So I didn’t need a convertible but found a really great deal and jumped. As a harnessed seat, it is really smooth, low profile, DD2 loves it, and climbs in and out herself. The install via latch is fine - not the best install I’ve encountered but definitely not the worst. It converts to a high back booster. I can’t remember if it converts to low back but we are pretty far from needing those and I already have a Harmony for carpool, so I didn’t really look for that feature when choosing the seat.
Mom to a spirited, red-headed, former 28-weeker 10/2009 and a more mellow monkey 12/2013.