I have a line pump, what would this do for me...easier clean out?

ive always liked having a vibrator. helps let the mixer know when the pumps on or off. as for easier clean outs, not quite sure.  if the mixers keep the hopper above the grill the whole time, a vibrator will make no difference.

Yes it will allow the mixer driver to know you are pumping since most dont know that if the hopper is going empty maybe they should refill it. I use the vibrator with harsh mixes so you dont get a build up on top of the grate. I use a chain link fence on top of the hopper in the winter so you dont get precast falling and plugging you up.

Take it or leave it i think , dont get me wrong the mixer drivers are too busy talking shyt to care about you vibrator if they dont fill it they let it suck air , ive had them and they work well when your doing civil jobs ( road work ) were the mix is very harsh . but otherwise no difference if you have mixers there pump the hopper down scrape the sides in it does the same thing if not better ! at the end of the day if you cant keep the hopper tidy during the pour its nobodys falt but your own!!! ( no offence meant )