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Excerpt from George East's review of the Tele Vue 5x Powermate in Sky & Telescope.
With a double star centered in the field, sharply defined, color-free Airy diffraction disks were readily seen, indicating good optics. As the stars were shifted back and forth across the field, their appearance did not change. The images remained sharp right to the edge of the view. Next, I placed the limb of the almost-full Moon near the edge of the field. Although this is a severe test for lateral color, the limb appeared sharp and free of color. I tried several eyepieces; all did well— East, G. "Test Report: More Magnification for Observing". Sky & Telescope (July 1999). Full Review.
From Sky & Telescope's Hot Product review
IMAGINE WHAT FUN GALILEO WOULD HAVE HAD IF HE HAD USED A Tele Vue 5X Powermate!— Sky & Telescope (Editors). "Hot Products: Getting Higher". Sky & Telescope (Dec. 1998).