Are they possible to use on other bikes with some kind of pannier holder?
Are the side cases rebranded/based on any other brand? If so, can you buy that case and use instead?
They cost me 8000 SEK or 920 dollars in Sweden. Do you think that's worth it or should i go for some other aftermarket case? Cause im thinking if i switch bike i ofc rather be able to use same cases so i don't "waste" too much money on it.
The factory cases are specific to the Versys. They plug into special slots under the seat grab-rail and nest into a rubber piece near the passenger foot pegs. They won't go onto a regular rack system on another bike.
On the Versys, the factory boxes are very nice in some ways, but I do have a major complaint about them. First the good: They are very quick to attach/detach from the bike. They are big enough for all of my normal needs. They are keyed to the ignition key of the bike, so I don't need to carry another key.
Now the bad: The shape is very inconvenient. They are not rectangular at all. This means it is difficult to impossible to get rectangular objects in. A brief case, shoulder bag, lunch bag, my Microsoft Surface tablet for work. All of them either don't fit or have to be mashed to get them in.
If you plan on carrying specific items like a bag for work or a laptop computer, take it with you to the dealer to be sure it fits into the factory luggage.
If I had it to do over, I would not have purchased the factory luggage. For my commuting to work it has turned out to be a problem fitting in the things I need.