Pine64 and especially the PinePhone with Convergence Kit. I realise that this is pretty niche and still somewhat rough and unpolished - but the idea of being a

Pine64 and especially the PinePhone with Convergence Kit. I realise that this is pretty niche and still somewhat rough and unpolished - but the idea of being able to plug a dongle to your phone, connect monitor+mouse+keyboard to that dongle and have full, regular desktop operating system seems very intriguing to me.