I, like most people who have used them, have come to dislike the disadvantages they present.
I built a couple last year trying to make at least two of those disadvantages disappear. They seemed to work well, so today, for lack of anything better to do, I built a few more.
Now, before you start yelling that I will have a massive robbery in progress, hush and pay attention, besides, Blue is nearby, he can handle the situation!!
First, why do Boardman feeders cause robbing?
The situation can be compared to tossing a single freshly cooked Prime rib in the middle of twenty starving men. Theres about to be a mess!
Now, feed those men well for several weeks, then toss that prime rib on the floor among them... they are likely to ignore it.
Use a boardman at the wrong time, when there is not much for forage, and the bees will come from far and wide to get at that syrup. So what to do?
I do two things. I put an entrance reducer in, and then I put on a robber screen in a loop over the reduced entrance. No bee can fly directly into the hive, and the entrance is small enough for the occupying bees to defend... In the pic I dont have the screen on, they are all at the house, but this is how I reduce the entrance;

The entrance is AWAY from the feeder. Making it a bit more difficult to get to. In so doing, even with last years nasty 4 months of 0 rain the bees never tried to rob one another. I will be finding out this year if it will work on Nuc's as well.
Next problem, is that when the sun warms up the jar, they tend to leak all over the place. I have pulled a jar, to find the feeder packed SOLID with dead sticky bees, and the syrup dribbling into the hive from the feeder... And of course the entrance was reduced, so there was a bit of a puddle around the entrance reducer...
So to fix that, this feeder is level with the bottom board. Even if it leaks, the syrup will not run into the hive and get trapped behind the reducer and cause a big sticky mess. Next, there is more room inside of this feeder. Less crowding, and as the feeder opening is 3/4" the same as the hive opening, the bees can get in and out easier, no pushing shoving, fighting or stinging. There are no turns or edges to block the entrance, it is wide upen to the hive. I also made it a bit deeper so that the 2 quart jars will go on it with a little room to spare..


SO.. robbing, and drowning seem to be going well.. what else don't you like about a Boardman? What needs to be done to fix it?
Scott