Ive had the Kengda unit since January, and its been a tank so far.
Battery life is amazing and I charge only once a month out of habit, not coz the bars fell below 2/3. Most people are amazed at how long the battery actually lasts.
The range on this unit is great and I’ve never had any issues so far. Absolutely love this model.
Now, as far as online support/reference material, there is none— I did the same searches as you when I got the unit and hit a brick wall.
I firmly believe that as long as the unit helps in communicating with the convoy, holds charge like a boss and feel as sturdy as it does, you haven’t made the wrong choice.
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In that case I’m sure to meet some of the DO marshals, since I’m pretty sure I’ll be getting stuck a few times.