I have a DTEK60
It's a good phone on the whole, but the support has been pretty patchy. As it's essentially the same spec as the Pixel XL, I had assumed it would at least get Nougat - the hardware is more than capable. The lack of updated OS I could excuse though, if it wasn't for their marketing departments promising that they provide the fastest rollout of updates, criticising other manufacturers for taking weeks or months to deliver security updates (https://uk.blackberry.com/smartphones/dtek50-60-by-blackberry/overview).
Yet after only 6 months, the DTEK60 has started missing the monthly security update releases (twice now, and the August update only lurched into view last week at the start of September), and the general response seems to be that they're only concentrating on the KeyOne now.
The promise of security and a rapid delivery of updates, coupled with lack of bundled bloatware and carrier addons was a key factor for me in buying the phone.