I went back to the GPE after using Sense for a few days. Performance is actually pretty poor, with music skipping sometimes just while loading web pages.
Also, battery life was worse for me than on the GPE. Not sure why, but it was.
After flashing the latest ADSP from the Harman Kardon M8, sound quality is also just as good as Sense.
Performance was the biggest thing, and it's weird that general navigation was faster on Sense but overall performance under load was quite a bit worse.
Sent from my HTC One M8 GPE using Tapatalk
iPhone 2G-5 (AT&T)
HTC One M7 (64GB, Developer Edition)
Galaxy S4 (16GB, AT&T)
Galaxy S4 (16GB, Google Play Edition)
iPad mini with Retina Display (128GB, AT&T LTE)
iPhone 5s (64GB, AT&T)
HTC One M8 (32GB, Google Play Edition)
OnePlus One (64GB)