I am a home user so take most of what I say with a grain of salt.
Using them for monitoring my own recordings with Sonar through a 1212M and playing guitar through them (LOUD) from a pod xt live as if it was an amplifier these guys have worked fine for me for a long time. I think 3 yrs now.
The line inputs are not balanced and the low frequency is 70Hz where better quality monitors would go lower.
In a nutshell they are not going to be as good as super quality expensive monitors as that isn't their price point but they have served we well and have been exposed to long durations at loud volumes without any problems.
The input options are flexible enough for what you want I think and you have got independent controls for the digital or line signals which makes it nice and easy.