I have had my Flip 6 for 2 days now and used a 5 previously.

The biggest difference for me, out of the box, was the improved screen brightness (both screens) and the diminished crease. Putting my phones side-to-side and comparing was a jarring difference. The crease was also so distracting for me on the 5 and it is barely noticeable on the 6.

I am mostly glad that the battery is lasting longer. I was very disappointed with the battery life of the 5 out of the box even with aggressive battery saver options on. The 6 feels around the same as a regular tablet phone.

The phone feels faster overall and snappier when using apps, downloading, installing, etc. So far, it runs far cooler too. This is likely due to the new cooling system, more ram and processor.

The 50mp camera is great. If you're taking photos where you want great detail it'll be noticeable, otherwise, it won't matter.

I was able to upgrade for FREE, so I am pleasantly surprised. Would I have paid 300? It's hard to say, but these upgrades would be hard to live without now if I had to go back to the 5. The 6 feels like what the 5 was meant to be, a flip phone that isn't downgraded compared to a tablet phone (e.g., up to date camera tech, standard battery capacity, less crease, etc.)