i have! i used it in my classroom - without a turner.
i #'ed the eggs and the did the X/O on opposite sides. i'd turn 3x/day (end-over-end 360 degrees, then 180 degrees to flip opposite mark - but make sure the wide ends is a little more upright and the narrow pointing down more) in the mornings when i arrived at school, at lunch, and before i went home (i went in over the weekends). it worked fine for me. i opened it a lot too to candle the eggs for my students and others who visited. on day 19 we added extra water and i didn't open the hovabator after that - until it was time to take the new chicks out.
my best advice, especially if your house has A/C is that even w/ a thermostat and the styrofoam the incubator is still susceptible to drafts. so i kept a pretty heavy blanket around it on the table but not over the viewing part.
we even had to move the eggs out of school towards the end then back into my classroom due to spring break in april and we still had 8/15 hatch!