We've been renting our washing machine/tumbledryer/fridge freezer since we moved in in '97. It's been good, because in that time I've upgraded them a few times (whenever the washing machine gets smelly ) but we're planning to give it up and buy our own after christmas. It's now got to the point where the cost of renting (even the most basic models) isn't really worth it.
ATM rent Bosch appliances (basic models) @ around £33pm (as I've had them since 2002), if I upgrade it's going to going to go up to £41ish.
If I buy interest free on my catalogue (Indesit and Beko iirc) it will cost about £50pm (WM isn't the basic model though) but it would be paid off in a year. Even if the WM dies in a few years (never had a problem with TDs or fridges) I still would have saved one or two years money (nearly £1k! OMG never worked that out before!)