I have had both vented and non vented. The non vented (condensation) dryer uses cold water to condence the moisture while drying therefore filling your holding tank. The non vented unit never completely dries your clothes. The manual will tell you to take the items out of the dryer , shake them out and then hang them up to complete drying.
I went to a seminar at Perry and the speaker confirmed this. Personnaly I like having the vented unit. I do a load every couple of days while in a park. Because the dryer is only 110 it takes longer to dry , usually 1 hr. Just a hint : because the spin cycle is quite powerfull it is a good idea to shake out the clothes before you start the dryer. It helps with the wrinkles. Just don't overload the machine.