telemetry is great for the TRX4I feel like including the telemetry is a pricey gimmick for people new to rc's. Having it available is fine but making it mandatory with the rig is greedy IMO.
it shows approach and side angles which is pretty slick for crawling
pretty useless on other models - agree 100% about not taking eyes off the rc @ 30+ mph
engine temperature was not accurate on my 3.3 revo compared to a temp gun. traxxas app was 10-20* off (higher)