I too have looked at these attachments and have been drawn to buy one. Like you, I wondered if they really worked. My feeling is that the cheaper ones on ebay are "generic" attachments which poses two questions: are they cheaply made in some foreign country and won't hold up or even work properly; will it fit my machine and work as stated? I am hoping others will read your post and have a review on these less expensive ones. Thanks for asking this question.