I ordered a Celestron 15mm 66° EP (gold-line) and a Revelation 2x/1.5x Barlow from Astroboot.  Instead of the Barlow however, they have accidentally sent me a Revelation Plossl 15mm.  I've spoken with them on the phone and they are going to send the Barlow asap, and have told me I can just test the eyepieces to see which one I prefer, then return the other. Anyone used either or both?  I know one or two on here really rate the GSO Plossls, and it does look and feel better than the Celestron