I wanted to get one, but didn't like the styling of it. The stock front is just so much better looking, in my opinion. For my setup, I'm hopefully not going to need any extra cooling (3600/2070 super). I think I'd be a bit more worried if I had some more power hungry parts, though.
As far as how effective it's going to be, I think it should do well. I currently have the TJ08B-E and it has a very similar setup for the front intake as the booster cell. I can tell you on my case it works extremely well, to the point it's the only case fan I have and it runs at around 800-900rpm. But on the flipside, there are so many more variables that can throw off cooling, like case pressure, direction of the air flow, etc - so nobody will know for sure until testing is done.
I will agree, in the sense that I wish we had more information to make better informed buying decisions. As much as I disliked the Ghost QC, they nailed it when it came to the PDFs they put out before the case even released. They had breakdowns with temp charts of the best CPU coolers, cpu fan vs water, case fan setups, etc. It was really nice having all that information before you even got the case. Removes a lot of the guesswork and had you prepared for the build the day the case landed. I'm hoping we get something similar from Alex, even if it does come later.