[Roo]

Been using the TracCom gear since late 2017 season.

The good:
Super clear audio, some students have actually commented about the clarity.
Proximity mics, minimal outside noise.
Separate volume controls for instructor/student
Uses 9-volt batteries, used two this season with second battery still good (12 events)
Easy to install in-helmet kit (recommend for instructors)
IMSA plug so you can use earbuds vs the in-helmet kit
More durable (than Chattershit) cords connectors

The bad (sort of....)
Max volume has been described as an issue, though its been more of an occasional nuisance not a full time issue. I've experienced this with two scenarios, when student does have the mic in front of their mouth, and when going above about 100 mph in a car with interior buffeting.
The battery connector wires aren't hardy (like 18 ga) and soldered to the underside of the board which cannot be removed. When mine broke because I removed the battery after each event, easy fix as I soldered it to the top side of the board which significantly lightens the bending load on the wires.
As 9-volts don't tend to leak, I don't remove the batteries now.

I'll be all the Potomac events for anyone who wants to borrow my setup to try it out.

Summarizing, I'd buy it again