Anyone Use Clay Tubes/Tonröhren?

[naturalistSean]

I'll be putting in an order with Schwerter in Germany. I was considering adding a clay tube pot. Here it is: Tonr?hren rot - 7 x 12 cm - Orchideen der Schwerter Orchideenzucht

Do any of you have experience using these? Are they worth it? Too wet? Too dry?

I've other plants mounted on cork bark and one on a clay slab but would be interested in a mount that doesn't need as frequent watering.