I owe two basses that I often like to carry along. The Mono has been perfect for me for the last year and half. It fits perfectly my two basses: Fender Precision and Warwick $$. It has a fair amount of storage room. The front pocket can hold cables, 4-5 pedals or a Tone Hammer 500 (!). I usually use the back pocket to put my iPad and partitions and the top pocket for picks, tuner, small note book, pens, ear plugs, etc.
Sometimes, when I have to bike, I take only one bass and stuff the second compartment with all my pedals, PSUs and the rest. Very convenient.
Only minor point: the inside layer of soft protection tends to peel off very quickly. I would advise you to be careful and gentle when folding in and out your bass, in particular when they have metallic parts (such as the back metallic plate holding together the neck and the body on Fenders) that can scratch the inside of the bag).
Last point: the modularity. If you need extra storage, you can buy Mono guitar tick bag. It firmly straps on the top of the Mono case. A very useful device with a very solid built.