@Snake122
Sorry for the delay. So, I tested the Grass monkey IR puck with TIR5 in MSFS 2020. I can report that it works really well. I mainly tested it out because the Grass Monkey was picking up some light pollution.
I would say that TIR 5 works better in sun light than Grass Monkey. However I do find GM to be smoother and more predictable. Of course this could come down to profile settings.
As mentioned I’ve been with TIR for years and I always found the profile settings difficult to dial in.
Conclusion, if you have TIR5 I would highly recommend switching to the Grass Monkey IR puck simply because it is wireless. It also ships with a plastic head piece so that you can use it with or without headphones. The puck detaches with velcro.
If you have your TIR dialed in where you like I would recommend sticking with it and using the puck. However if you find it finicky or if you haven’t purchased a tracking unit, I would recommend the full Grass Monkey King unit. I believe it is also cheaper than TIR5.