Been using milc feed for about a year, working very well for us. 

I have android tablets in loader and feedtruck, they have data plans on them that run under $15/each per month

Small price to pay to keep everything updated and operating smoothly

Very handy to check feeding progress or change pen sizes or dry matter numbers from my phone or office computer - and changes show up almost instantly in the loader or truck

I would call Milc - have had a few issues when we started using the software and they were very responsive and helpful - I'm sure they can answer your specific questions