We've had three Splendide washer/dryers. We'd only have the vented models. We had one in an RV, and two in our current boat. The original one in the boat died two months after we moved on board. It was about 35 years old, so it was entitled! We replaced it with a three year old w/d that was taken out of a fifth wheel because the owners wanted more storage. It was unused.
As with anything, if you don't follow the manufacturers instructions, overload it, or abuse it, you probably won't be happy with the performance. But follow the instructions, and you'll be happy with it!
For us, having a washer/dryer, and an icemaker, among other things is the difference between camping and living!