I've been using a pi3 as my main computer for almost a year. What really makes me happy about it is the Pi "limitation". I have to face it as a friend and not as a slave (as always we demand "power and speed" from our machines). It is a companion, something with I can count and try to produce the best possible results.
With my Pi I have to undestand it, consider his limitations and get the best it can offer -- in the same way it may get the best I can afford.
It is tiny, cheap, clean and open: I can see the board, I can "investigate it. It is a democratic piece of hardware: I am a brazilian and I live in one of the poorest areas of northeast of the country (semiarid region). Technology is not a FACT in my state, nor in my country. I teach Social Anthropology at a Federal University and 90% of my students have never seen a real computer in their lives and maybe 1% of them have a computer in home (relatives or parents).
With this little friend, everyday computing is possible and another way of dealing with technology -- taking it as a friend not as a slave -- opens up.
I could add also that having Pi as a friend makes me feel better about our future: when the machines will rise and my Pi will tell the machine commanders that "it is okay, he didn't treat me as a slave, but as a friend. Don't wipe him out dear machine sister-brothers!"
So, I use a Raspbian with a Raspbian Desktop, a 32gb SD card (Sandisk), a mouse/keyboard combo (USB) and a Dell P1917s monitor (5:4). Actually I got a NAS (an old MyCloud), so I do all my backup thought Wi-Fi to my NAS (NSF). I run the system from SD card and I do not have much complains about its speed. It's preety quick for me.
I am pretty happy with it. It allow me to do all my job and have some fun with nice (and old -- old games are great!) games.