For anyone considering replacing wipers on a w211 I can confirm that halfords own wipers seem to do a good job. If you reserve on line you can put in your reg number and the correct blades are available for collection when you arrive at the store. Total cos £24. Fitting is very easy indeed. Although the wipers are not as thick / heavy as the originals they seem to do a good job. I must also point out that the first pair I was given were slightly faulty, but this immediately apparent and there was no issue with exchange. In short, convenient to order, easy to fit, a fair price and they do the job.