Used this to transport our 5kg cat to the vet and on the bus and trains. I generally used it as a back-pack rather than wheeling it along bumpy pavements, etc. Comfortable enough once adjusted although not that well padded - but definitely better than trying to carry a heavy cat in a hand-held bag. Our cat loved being able to see out through the mesh; a more shy cat might feel too exposed. Great to have the height that the cat could sit up and trun around although had to lie the carrier on its back during train journeys to allow him to lie down comfortably - smaller cats would cope alright though.
Seems strong enough although the handle can rattle a bit and the cat did not try to escape - claws and teeth may do some damage to the plastic mesh if the prisoner is determined. Generally quite satisfied with the purchase.