I don't actually dislike it overall in concept, but it feels very buggy to me in implementation. Sometimes it will just stop working entirely until I reload: clicking on a tweet to have a detail view slide out in the right panel will work for a while, then at some point I click a few times on a tweet and nothing happens. Not sure if some script is hanging or it's due to timeouts or what, but I notice this throughout the interface, which makes it feel very unpredictable.

I would like middle-click-to-open-in-new-tab to work more consistently as well.

I'm sure plenty do, but satisfied people don't complain, so you never hear from them.

Frankly, I don't use Twitter enough to be affected by their UI in general, but I strongly dislike the URL hacks. I think websites should stick to real URLs, and only use Javascript page changes if the new History methods are available.

It'd be really nice, if the UI wasn't so slow due to all sorts of javascript and CSS bloat. Scrolling is really jerky too.

Thing is, if you got a new/fast computer, you don't notice this, and then yeah, the new interface is just fine.

Except that, for the functionality it provides, there's not really a good excuse for the page to be so slow.

I like it too. However, it is a little slow at times and I do get the "there was a problem sending this tweet" message a little too often.

It's particularly bad whenever you try to go through a long list of people you are following and try to unfollow lots of them. Takes an age to respond to clicking the unfollow button.

I like it as well, it has it's issues (any overhaul that large is going to have bugs relative to a design that's had significant time in production to uncover issues) and I'm always amazed that folks don't understand that if you maintain old UX indefinitely to placate a small majority of users, you end up creating technical debt that slows down product innovation.