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I have been doing some reading about the effects of Barlows in recent hours, and from what I have picked up, the effect of extending the eye relief is more exaggerated with the longer focal length eyepieces. So, for example, you might not notice a great difference with an eyepiece in the 5-15mm focal length range, but the effect may be quite marked (such as an increase by 5mm) in an EP in the 20-30mm focal length range.
Others with practical experience may wish to confirm or deny this.
BTW, one of the benefits of the Powermate is that apparently it does not increase the eye relief. So if this issue is a major problem for you, a Powermate may be worth the added investment.
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