I have a Splendie non vented washer dryer combo and love it!
In my opinion you just have to learn how to use it and I wont say properly, but use it within its limitations.
It is small. Much smaller than my home unit. I have found that if you fill it up 1/2 to 3/4 of the way, and set the dryer timer to 80 minutes it works great.
What I do is be careful not to let the dryer stop on its own. I pull the clothes out and shake them out and lay them flat on the bed
. The clothes come oout of the dryer very warm and a little damp.
About an hour later they are perfectly dry and I can fold them and put them in the drawers.
Hanging clothes go directly from the dryer to the hanger. No need to iron because the wrinkles come out on the hanger.
Having a washer dryer is one of the things that makes our boat more like a real home, as opposed to a oversized camper.