The size is great- my 2 20 lb cavapoos fit in there with plenty of room but it only folds down if you remove the handle and it takes a lot of elbow grease to even get the handle attached so it's not very convenient to take off and on.  I am also not sure what they mean by detachable carrier because nothing detaches.  I didn't buy it for that so it does not matter to me but it could be misleading.  It's pretty expensive for not offering much.  Wheels do brake well and turn nicely.  Works best if it can be left up and it's very big.