I personally tell you that the full time Purism devs were instrumental in helping me port MMS/VVM to Phosh/Chatty (without their help, MMS/VVM would not exist for Mobile Linux) and they have gone well beyond what I would expect any company would do to help out Mobian/pmOS/overall PP/PPP development (they no doubt help out other distros too, but I don't interact as much in those areas).
I also have an L5 sitting on my desk that I am using full time, and have had it for several months by now.