Ive been using the 2x 2 Powermate for a while now with my TEC 140 Apo and was in need of more magnification for planetary work. So, I bought the 4x 2 Powermate along with the adapter for use with t-rings. My first light for the 4x was on Jupiter and the results were absolutely stunning. The image quality was superb. I was initially going to rate this a 9 just because 10 is perfect, however, I cannot imagine anything performing better than this.