Salut ace30. My 2 cents. Maybe but this manufacturer is a pipe bender not an exhaust specialist. If you just want more noise or luggage space or like their looks go for it. If you want performance then choose an exhaust specialist who actually developed their product with dyno validation.
ace30, Our friend whippers is not wrong but, fare enough, his answer wasn't fully inclusive. Those 201 silencers are a very simple and a long established design. I'm willing to assume that you are not changing header pipe. Just changing the mufflers. Then you will have eliminated two cats right off the bat. They are straight through silencers with an expansion bulge in the center section to reduce the noise level. The interior pipe has louvers to allow that expansion. But there are no internal chambers which would demand a flow analysis. Thus, ergo, why use a dyno controlled by the manufacturer to post a set of very subjective numbers. If you choose to use a set of baffles, those will add some restriction that can be measured with a flow meter or even a child's pinwheel. You, the user, can adjust the flow of the removable baffles with simple hand tools.
Where whippers is especially correct is if you are buying a full system and one with chambered silencers and or scavenging. Then you should be looking at some tech specifications to guard your money.
If you except the basic principles of an internal combustion engine and the age old analogy of a "air pump" then you can be confident that if you also let some more air in and mitigate the current air/fuel lean status ... you will get better performance. If you change over one side at a time, you can do your own pinwheel or ribbon test. It isn't rocket surgery. The AEW 201 units are well made and have better than average finish. They are, as you likely know, considerably lighter than stock and if I recall take about 6 inches of width off the bike. You already mentioned the extra luggage capacity. Looks are looks (until its close to closing time).