This is a great headset. I found the passive noise cancelling to be around 25-30Db (roughly), and the connections for 2 radios work pretty well.
I have used this headset on a couple of events that i volunteer for, as well as the Acura Grand Prix (as a spectator) and it worked well. I was actually able to attend a full day of races, and not have my ears ringing at the end

2 drawbacks that i have seen and they are minor:
1- i get the logic behind it, but you can only hear 1 radio in each ear cup. If you are only running 1 radio, it can be a little disorienting at times, but do-able.
2- no separate volume control. you are at the mercy of the radio you have connected to the headset. if the radio output is low, there isnt much you can do about it.

I was happy that i was able to find most of the adapter cables i needed at PCI. I had to source a Motorola cable from another company, and an adapter for my cell phone from Amazon. They do exist but are hard to find, and they only go to 3.5mm, then you have to get an adapter for USB-C. The good news is, if you find the right adapters, you can actually use your cell phone as one of the 2 "radios". the mic works and everything, and you done need to push the PTT to do it. This does go back the volume issue though. The volume is pretty low and no way to adjust.

overall a great headset.