Based on my fairly extensive experience in this area, a double at an MP is very much a YMMV kind of thing. If you know the MPAs well, and have visited them previously on a solo basis, you may be able to have a very interesting time. But if the girls are not familiar with each other, or are shy about the duo thing, then it can be quite disappointing. I've had it both ways and would now only go with 2 tried and true MPAs, and not risk my time and money on unknown quantities.