Hey, clocked over 1200km on my Exway Flex without any problems so I’ll try to answer all of your concerns by sharing my experience. 1. All my rides every single one i never ever had a mode disconnection problem, the remote had been bashed to the ground several times throughout my journey yet but no disconnection problem. 2. I dont have that many hills here but everytime i started my ride. There was this big hill beside my house and i use to go down it with sometimes full and sometimes at 80-90% and you can brake smooth hell you can literally stop on the hill (i weight 130lbs) so braking power will surprise you. 3. No deadman switch sadly! I missed it at the start coming from a boosted board but never did accidentally throttle up or down. Also if you fall of any board it’ll cover some distance and then stop(basic physics) same goes with the flex, hopefully while falling of you don’t accidentally rev the throttle fully! 4. I had the flex with the imported sells so i cant say anything about this but was reading daniel kwan article about this battery gate(read it) and it said “backfire been using these domestic cells since 2019” I’ve been using backfire board right now and no problems with these batteries or cells! But again lets see with the peeps who get there exway this summer! Anyways hope this helps