I always check my edits on:
iPad, iPhone, Android devices, 2 laptops, my BenQ of course, and one at work. The photos pretty much look the same with the exception of a slight color shift but as far as exposure goes it looks good.

I worked with Mpix, they asked me to upload 5 photos, they are going to not touch them, print them and send them out to me and I will compare to my settings:

120cd/m2, 55 brightness, 50 contrast and newly tweaked sRGB color profile (which btw looks better than before).

I had ordered a photobook through Mpix just to show our clients what some of the nicer products would look like, they all came back perfect, just as they had looked on my monitor which makes me happy.