@Ekstreme Can't really tell the exact "which one" without some digging, but they are the "around $2 a piece from china"-ones and arrived overly sensitive and erratic (check my fix video for it if you want to see the difference).
As I remember the NES controllers, I can't recall them being "spongy" like these are. This has not been a issue for me though. Don't know how they would fare in Track&Field type things yet.

I was able to create a Symlink with an udev rule but have no clue how to create a joystick profile for the created symlink with emulationstation.

@ven9 Please open a new topic for your issue - and add more details about your system as requested in https://retropie.org.uk/forum/topic/3/read-this-first.

@unkis17 Honestly m8 I am not sure. Never tried what you are doing before ;-)

@Pifan - I pulled the trigger on it a couple weeks ago actually! It's going pretty well so far. I'm taking my time and documenting a worklog over at bitfix gaming.

@BuZz
Thanks!
So the (re)installing process remains necessary, but now we can do it from binaries, right?
And on RetroPie 3.8+ it won't be necessary, right?

add "usbhid.quirks=0x289b:0x0002:0x040" (without quotes) to the end of the line in /boot/cmdline.txt. it will split the controller into two. Check out anything about the Xin-mo arcade controller to get more info, a lot of the same stuff applies

@jimd0586 yesterday, RetroArch added support for light guns in the same category as the AimTrak. I've tested this new functionality with a Dolphinbar/Wiimote and it works great.

Since I don't have an Aimtrak gun I'm hoping someone who does will be willing to rebuild RetroArch from source and try out the new feature. Any chance you have one and would be willing to give it a try?