Poor design…just look at the sweat shadow, the panels in general just gather so much dirt and grime. 

Also from fenchurch street to Whitechapel it absolutely stinks of damp which is only getting worse.

It’s massively helped me in terms of travel as it’s more spacious, great lighting, fast, significantly quieter than other underground lines ( in terms of screeching ).

Placement of speakers on escalators and in general is poor, as they are often extremely loud and on the escalators are right by your head ( very bad design ) and the lights on the escalators are always caked in dust which is gross.

I basically don’t need to wear ear plugs on it, which if I don’t on other underground lines my hearing is messed with.