I’ve had a lot of experience with Brawler 64 controllers. I bought the original one for the Nintendo 64, the wireless upgrade and Retro Fighters sent me this one; for Nintendo Switch Online. I reviewed them all on YouTube.
This particular Brawler 64 received multiple videos.
I found the controller is well constructed with decent battery life. I covered my thoughts in the video below.
The controller is solid and if you want to get one you can do so here.