Like @t-b I'm using a LineageOS device lately but not as my main phone (I still use my N900 for basic stuff as phone calls, sms, e-mail, ssh client and also gps sometimes - thanks modrana).
But when it comes to heavy websites and youtube videos (as an example), the N900 becomes quite unuseful, so I use the LineageOS device (but without GApps).

Yeah that one is quite good, I really like it