I had one of those washer/dryer combo from LG about 10 years ago.
Pros:
- Absolutely sipped power
- Being ventless, it put very little heat and humidity into the condo, and required zero make up air re-heat or re-cool
- one load in before work -> one load out after work most work days became our typical use cycle
- never forgot to move over and dry clothes so they never got that 12 hours in a wet washer smell
- Had a quick steam setting that was great for relaxing wrinkles, or getting the "this has been in the closet for 8 months since I wore it last" funk off of a single shirt or something
Cons:
- Somewhat loud, on again off again noise profile
- Small internal volume, and you absolutely couldn't pack it in
- Loooooooooooong cycle times, especially in dry, quickest might be 3 hours, a load of bulky or jeans could be 6 hours to dry
- Never got the clothes 100% dry, towels and sheets forget it. But leave them to air cool off for 5-15 minutes and then the last bit of moisture would go off before folding and putting away
- Couldn't handle beach sand, heavy pet hair, etc. Cleaning the drain trap was somewhere between a daily and weekly maintenance operation
I have a separate washer and ventless inverter heat pump dryer now. Takes up more space (but I have plenty in my current house), and yes you have to move over clothes, but honestly it handles more per load so the time factor balances out.