i have both a grex and sima ct2. i normally run s vid cable from tosh 5970 out to ct2 or grex in/ out to tosh dr2 or pan es15. the ct2 is sharper but sucks a little black level out, the grex gives a little softer image and a little dimmer (as opposed to lower black level). i actually have 2 ct2s, the first i bought 8-04, the second, 8-06. the first ct2 only sucks a little black level out of the image, but the second, newer ct2 takes a lot out, rendering it almost unusable (except when recording w/ pan es 15, cuz u can add black level to signal in the recorder.) however, i can copy anything to anything incl. vhs to dvd. to the best of my knowledge, CORRECTION/EDIT-ct2 accepts analog source, then digitizes the image, then back to analog. the grex uses analog 'conversion', but they both have analog composite and s vid connections. id have to recommend the sima ct2 over the grex. i watch on a pan 720p pj w/ 108" screen so sharpness is very important to me. w/ the ct2 the home burnt flics are very watchable.