I just used it for first time this past weekend at GTA Buttonwillow event, one session it couldn't acquire satellites, and one session it failed to 'save' my laps... other than that was flawless... and became quite enjoyable 'yelling at me' 
It's very easy to use and reference data/laps/images which is why I went with it. I've never been able to pay attention to dots and lines/charts... but videos and images I can handle.
Here's a video of my lap from Buttonwillow:
https://youtu.be/7ocEbB3Yfs0
Best regards,
Dave
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2022 SS 1LE - Vivid Orange - SCCA CAM-C & Optima Ultimate Street Car GT
Katech, MSD, QA1, Hurst, Anderson Composites, ProParts USA Custom Suspension, MFR Engineering, Forgeline Wheels, G-Loc Brakes, Nine Lives Racing, MTX Audio, Penske Rapid Repair
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