Fast as hell, using the snapdragon 820 and 6 freaking GB of RAM (that's double S7 and six times iPhone 6)
Good battery life b/c 1080P screen
User friendly near-stock Oxygen OS
Super-fast fingerprint scanner
Camera is "as good as last generation's best," so think Galaxy S6 or iPhone 6 level, not quite S7 or 6S.
Screen is only 1080P (good for everyday use, but not for VR).
No SD card expansion.
That's about it, a lot of the issues with previous 1+ phones have been ironed out, such as lack of NFC, invite system, and unstable OxygenOS.