Not super-light but a nice ride. @User has done some miles on his. Mines almost not quite roadworthy :-/
£299 complete is good value!
I built one a while back too. I run mine with 28mm tyres and mudguards. I commute on it, bike pack and use it for club runs. It is very different to my carbon bikes and full on winter bike, but it is great fun. Comfort wise 100 miles should be fine, hill wise, that is up to you.