I've been doing it for years. Works for me.
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While i've never used a bulk eraser, i would have to imagine that the effects would be both beneficial and subtle if they are anything like what one achieves using a Bedini. The advantage that the Bedini has is that it should be quite uniform in "de-mag'ing" whereas the hand held tape eraser might not be. On the other hand, the tape eraser may be more potent, so it may do a more thorough job.
For those that are "unbelievers" about the subject, you should take a look at this website and read this article about aluminum being magnetized prior to spouting off about the subject. Sean