I've tried a number of different saddles some with cut outs, some without. I'm now pretty happy with my usual seat, a Charge Spoon.
In the last couple of years we've started using our tandem for longer rides and are looking at ways to make the bike more comfortable.
Having ridden the "new" bike for about 1000 kilometres now, I've made a few changes, mostly for comfort and convenience, whilst adding weight.