The HTC U11+ is a refined version of the U11 which was one of the better spec android phones of 2017. The new iteration boosts speed and a screen that goes from 5.5 inches to 6 inches. Space was accommodated for a larger screen without making the phone itself much bigger which is a feat of design and engineering.
For many, the big disappointment will be that it seems HTC is not making a US version of the U11 Plus and leaving it only for Asia and Europe at this time. The US market is very competitive and HTC has had a hard time penetrating the sales ranks of the Samsung, Apple and Google phones. If you indeed are able to get an HTC U11 Plus the Slow motion component has a 120fps full HD 1080p spec that should be competitive.