Just signed up to respond to this thread. Bumped in to it while searching for new lease clarity fuel cell. Got 2017 Clarity fuel cell late April 2017. Extremely happy with it minus hydrogen filling pain last year that lasted June - Dec. Fuel cell stack was replaced last year March 2019. Even before there were any problems visible to me, out of the blue Honda called me end of Feb 2019 and asked to make an appointment to replace the fuel cell stack with less than 0.5 kg in the tank. They told me that the car sends diagnostic data and they project potential fuel cell problem. Preemptive action would be to replace the fuel cell. Made an appointment and it was replaced in a week. Car was driven additional 300 miles after fuel cell replacement for quality assurance. Got a enterprise rental for the duration of repair. Drove 15K miles after the fuel cell replacement. No problems. Looking forward to lease another hydrogen vehicle. Tried Nexo but it is a different class of vehicle and hard to justify the additional $$$ compared to Clarity. Mirai is cheaper to lease but 4 seater so no go. Most likely I will end up with Clarity fuel cell 2019 or 2020.