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I used an older version and but sold it because I am at the 1/4 all the time and that is the most accurate measure.
I did make a few runs with the g-tech at the track and found the 1/4 was off by maybe a tenth or less. The MPH on the g tech will be higher than at the track because the the track measure average over last 60'
If you have the consistent space needed to use it and no regular access to a track, it might not be a bad tool. The key is the space as you will have drive at street illegal speeds to get the measures.
I borrowed one, & like the others say its off a few MPH & ET.
However it did clock me 0-60 MPH in 4.03 sec Ralph did some math & said that # sounds reasonable.. ?
It did repeat about 3 runs from 4.02 - to 4.06 with BFG, How accurate those # are is a guess..