My experience with the Ryś MKII USB Adapter has been very positive.
I've tested a 1Life m:quick USB optical mouse and it works wonders. I've also tested the Dell M0A8b0 USB optical mouse and it worked very well too.
I've also tested a NPlay GX102 USB gamepad, a Hama Black Force USB gamepad, a Vinyson Dual Shock Power Pad II and they all worked very well, both in joypad or joystick mode.
I've also tested a Playstation-to-USB converter, the APL Super Dual Box Pro with a genuine Sony Dual Shock II gamepad and it also worked well.
As for bad news: I tested a Microsoft Wireless Mobile Mouse 1000 and it didn't work.