The last 2 LG flagships had major flaws in hardware. I wouldn't take the G4 or V10 for free. Beautiful phones, but that's cosmetic.
My response is wait 6 months to see if it's a novel idea with poor execution or a functional innovation.
The best modular phone that we have on the market now. I also saw the review in http://www.cnet.com/products/lg-g5/ and am impressed.
What do you say ?
Note: link from OP went to forums by accident. Moderator has corrected it to go the review of the phone.