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Tern TX has two more buttons. That's a personal preference. Some have indicated they prefer the two button navigation as compared to the four button. The four button does give you the ability to go back, though.
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Too many buttons. Too many batteries. Duh.
Don't use the "extra" two buttons and you have the "same" 2-button interface - problem solved [yea, yea, But failure points - uggh ]
I would really like to have the quick-switch AA-Battery supply over the rechargeable, or at least a DIYer & "shop"-replaceable rechargeable. $30 for a battery and Oring to have a fresh rechargeable every couple years would not be too bad.