I have a washer/dryer as I only have room for one machine. I have an indesit, had it for 3 years with no problems (touch wood!) As far as I know it plumbs in just the same as an ordinary washer, but I let the men from Currys do that!
On the whole, no problems and would recommend......
I have a Servis Washer/Dryer for same reason as above - no space for two machines. Bought from Argos four year ago for less than �200. in sale. They just plumb in the same as a washer only.
Have heard negative remarks from people who have never had one but I`ve had three over last twenty-five years with no complaint that was a direct result of being a washer/dryer.
Do you normally have a separate drier and washer or have you never had a drier?
I didnt like the washer drier as it took 3 times as long for drying than a tumble drier did and I was used to drying the first load whilst washing the second at the same time, which of course you cant do with a combined machine.
Had an indesit and it was useless, only lasted 21 months. Previous posts are right - you can't wash and dry at the same time which can be a problem, and also the drying takes longer than in a standard tumble dryer. On the plus side, they do save space, and if you don't have much washing/drying to do then they are probably OK. However, when the washer dryer broke, I spent the extra on separate appliances and haven't regretted it