I'm an indoor sim golfer - been playing for around 8 years using a GC2 with HMT.
The Garmin R10 was of huge interest due to the great price point and I am thankful to have received mine quickly.
I've been testing it against the GC2/HMT and have noticed the biggest differences to be related to Spin axis (club path) where GC2/HMT shows in to out and draw ball flight, whereas R10 shows out to in and fade ball flight.
Also.. with 3W and driver I am seeing a lower launch angle with R10, by 3 degrees or so.
My videos on YouTube are below.
Is there anybody at Garmin I can speak with to understand more about the unit and see if there are things I can do in my setup?
Thanks, Phil (v8burble / Hybrid Me)