I decided to upgrade to the 8+ from a 6 and it hits nearly all my points except for the slight negative that the form-factor is relatively the same (irrespective of size).

It's a great upgrade so far. The UI is snappy quick, the cameras on the back take amazing photos due to one having both OIS and digital stabilization, and the second also having digital stabilization. The resolution still looks good, etc.

I'm pleased with not needing to wait for the X, especially with the (supposedly) low supply at launch.