Most of the guys on here have this model, this is just the first hit I found on the bay, shop around and you can find them cheaper so yes well under £50. Think I paid £25 and mine came with a bottle of cleaner solution for jewelery and some accessories.
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Are they worth it? yes but they are not the panacea to a clean razor; but they do get into the nooks and crannies, just don't overuse it. I was tempted once to use rotary tools but there is no substitute for a good soaking and a good scrub with some elbow grease to polish it up.