I own 3 Mono M80 bags, and when I needed another bag I've decided to try Gewa out of curiosity and because I like its design more. Boy, was I pleasantly surprised!
Materials feel top notch with the exception of bottom protection that is made out of foam-like material, where Mono uses rubber. However, that material is lightweight, so if it is also durable, then it might be even better. Time will tell.
All locks and zippers are nice and solid. I think Gewa's zipper handles are plastic (maybe with some metal), while Mono uses metal. However belt attachment is from metal at Gewa, where Mono uses plastic. Both companies use great materials.
Top handle is big and soft, feels very comfortable to use it. Belt is nice, but I like Mono's belt a bit more (Mono has integrated gel for padding, while Gewa has movable padding patch).
Backpack straps are comfortable, but I wish padding extends a bit further (longer) - if I increase strap length, then my shoulders are almost at the end of padding. Being able to hide straps in a special compartment with zippers is a neat feature, however I'm a bit in doubt about zipper positions: when straps are out, two zippers end up at the top between the straps, and I'm afraid that they might encounter some stress and fail in the long run. Mono has a bit more elegant solution for hiding straps, that can also be used for laptop storage. Strap compartment of Gewa is less comfortable for storage due to lack of padding (you feel it with your back).
Now to the cymbal compartments!
Main compartment has a creative magnet lock. Despite my initial skepticism, it works really well. It took me 5 minutes to get used to it, and after that using it feels natural (and it's fast!).
Thomann writes in the description that the bag has 3 cymbal compartments ("A = 22" cymbal / B = 16" cymbal / C = 14" cymbal"), while my bag had only two (plus compartment for accessories). This doesn't bother me, but double check it with Thomann if you really care.
There are 3 separators inside the main compartment. My biggest cymbal is 20 inch ride, but I'm confident 22 inch will fit as advertised. Padding is thick and stiff, so it feels like semi-hard case.
Hi-hat compartment has one separator. I use it with 14 inch Hi-Hats. I think 15 inch will fit as well, but I'm almost sure that 16 inch wouldn't.
Materials inside cymbal compartments are nice and soft - I would easily entrust my cymbals to it.
Accessory compartment is large in diameter, but feels tight - I would appreciate few millimeters of extra depth.
Despite some of my critics, it's the highest quality bag: materials are great and it has few neat features. I think it's at the same level of quality as Mono cymbal bag, but cheaper. Highly recommended!