When I used one of these (we used VictorOps^) what it was really missing was 'fairness' as you say in the 'takes/trades'. We were rarely called and paid handsom

When I used one of these (we used VictorOps^) what it was really missing was 'fairness' as you say in the 'takes/trades'. We were rarely called and paid handsomely for it, so although nobody vocalised it, there was definitely a rush to grab it (because that was the 'system') if someone announced they had to put one up for grabs (due to holiday clash or whatever). Really I think that should have automatically de-allocated some future rotation of the taker's, and definitely would've helped if it hooked into the holiday calendaring system, so anything booked far enough in advance was already avoided. (^Not to slam VictorOps specifically, for all I know we just didn't have it configured well and it is capable of all that.)