Good article Here
My wife's cousin bought a cheapo , Chinese heap of junk from Argos, lasted all of 13 months.
Get the best quality you can afford, don't beat yourself up worrying about energy labels.
An ISE or a Miele will cost you a decent amount of wonga but will last you many, many years , the ISE for instance has a 10 year warranty, that works out at around £90 per annum and it has a high energy efficiency rating. It will be more likely to last at least 20 years. It doesn't need a maths genius to work out which is the most economical option in the long run.
That which can be asserted without evidence, can be dismissed without evidence.