Having listened to the samples on the T-Rex page, it sounds like the Octavius has the same slight tracking delay common to these devices. It's really apparent in the video by Brett Kingman.
Is it the boost which makes you claim the Octavius beats the Micro POG? I don't know... if I were going to spend the extra money, I'd probably go just a little bit further and get the POG2, which has the filtering functions and presets for less of a price difference between the POG2 and the Octavius than between the Octavius and the Micro Pog....
Could you be more specific in *how* the Octavius "beats" the Micro POG? I'm not seeing/hearing it, except for that one difference you note, and I don't know if everyone would count a clean boost as a make-or-break feature, especially if you already have control over the three octaves (original and octave up plus octave down) available.
I look forward to the details!