My U3 are like my cats, they need a bit of attention but most of the time they're fine.
I don't think that the occasionnal zombie is a problem (well, unless it's a cat then it'll eat you while you sleep)

How many do you have? When I had 3 on windows i caused multiple times a day of attention.
The worst ones were if I was not around it sit there zombied, and no hashing. CrazyGuy's R1 really is great at fixing zombies.
I have 6 running on a RPI2
(Clic to enlarge)

I monitor them nearly constantly (using cryptoglance) when I'm working from home, and when cgminer doesn't manage to restart the occasionnal zombie, I get to unplug/plug the USB cable.
it happens 2/3 times a day. (and not 2/3 times per U3, but generally)
I have 3 running on the power adapter and 3 on a 650W power supply that also runs my BFL30Ghs and 4 fans.
I've ordered shorter USB cable so I don't have to loop them as I'm doing with the long ones coming with the U3.
select the custom firmware when ordering.
With it you won't even be monitoring like you have been. With my 3 I was constantly walking looking for red LED (I had in a spot I walked past so I could see led to verify still mining). But with the the custom R1 I not only don't have to monitor but I don't have to reset, it does it all. It's a lot for me personally.