Apart from Daniel (who I've never done a trip with) what other differences between Tanisha and, say, Excalibur, that would account for the over $30 price difference for the same trip? Is it just quality of the specific guide (that you may or may not get in the end, it turns out), better boat, etc? Most everyone seems to agree they're the better company, but I'm interested in knowing quantifiable reasons for why. It's good to have the other side of the coin too... not every company is perfect, it's nice to have a balanced picture.