I liked the look of the E5 Ultra as have both the E5 and E5 Plus models.
A little larger then the E5 Plus but I put that down to the increased battery size. Light levels are excellent and battery life good too
My only concern is that the slider switch feels a little flimsy, it doesn't "clunk" solidly in between the Off/COB/Top Lights and I'm hoping it doesn't break. For that reason I've given it 4 Stars. Maybe this switch will be on the early production models and, if any similar feedback or broken switches from other users, Klarus will swap it out for a better switch. Or maybe mine was just a 1 off!
Otherwise I like it and pleased with performance and battery life

This mini flashlight is one of my Favorite EDC, offers a lot for its size like the EDC23 or GR36 and if you already have the E5 or E5 plus like i did. make the upgrade its worth every Penny! alone the Battery and the Spot LED improvement its worth it.