Frankly speaking, if you just compare the as-is-functionality, the Extreme is not giving you much that justifies the price difference to the Pro.
Buying the Extreme is a bet into the future. You get the option of additional functionality like geometry correction or frame interpolation for instance. But this added functionality is not there yet, and i´ve got full understanding for people not taking into account what they might get in the future but just looking what it´s there right now.
I think this is an extremely pertinent post, and the bolded part explains precisely why I went with the Extreme. Deciding between this and the Lumagen was a tough one for me, as I'm quite sure I'd be perfectly happy with either. Their relative performance will likely go back and forth in coming weeks and months, as each optimizes their firmware, so the question of which one is currently 'better' is not especially useful (to me at least).
So I'm placing a bet on what the Extreme will bring to the table in the coming months. While I can deal with the mild barrel distortion I have with the DCR, being at the lower limit of throw distance, it would be nice to be able to get rid of it. Similarly, I look forward to what the Envy's motion options will bring. Throw in other AI-based algorithms, and I'm hopeful that the Envy will continue to improve an already stellar image.
I watched the new Mulan on Disney+ last night, not even on disc, and was mesmerized by the picture quality. The sharpness, colors, the HDR rendition, all combine to produce an almost '3d' like image at times. And just for the record, I'm not thinking or claiming that this is better than what I could achieve with the Lumagen, as I don't have one to make that comparison. I'm just thrilled with what I'm experiencing, and hoping that my "bet" will pay additional dividends down the road.