The top-load opening is a lifesaver for my squirmy older cat, who hates being shoved through a front door—she just settles right in. It feels sturdy for the price and the latch clicks shut securely, which gives me peace of mind on longer drives.
My anxious cat actually walked in through the top opening herself on the first try, which is unheard of for her. The vet-recommended design makes nail trims and carrier exits so much easier on my back too.