I have 2 of these and they are fantastic.
You can take the bowls out without opening the door.
With regards to opening the top, it is a bit fiddly at first, but practice if you get one without the cat in and you will get the hang of it.
You put the seat belt through the handle. I wouldnt say it was that heavy.
Its very sturdy and spare parts are available from the manufacturer.
Zoe, I'm sorry you had a bad experience with yours, I havent experienced that with my cats. They are Ragdolls though and are placid in the carrier.