1. iOS: App has always been slow! Syncing takes time(should be seamless), animations hang up in between and there is sometimes seconds of gap between a tap and result. When you search, it takes lot of time (I have iPhone 4S and iPad 4th gen, same on both, so not a device issue!) A handy feature is document mode for taking pics but it chokes on multiple images. Many times, it crops images randomly and throws them out of order.

2. Windows: Features and apps are not well thought out. They have Skitch for screnshots but it sends screenshots ONLY to default notebook. I want to keep them in a different notebook but it won't let me customize. The editing is very hard and you can't paste HTML text reliably. Windows client has many good shortcuts for sure, but it also has unusual behaviour like tab not taking you to next relevant field (enter a note title, hit tab, suddenly you have selected the notebook!)

3. Web: Web clipper has improved in latest version but still has lot of issues like not syncing PDFs and images(happened twice to me, had to manually copy image). Going to PDF (Chrome) and then Saving it will not work. It will sync indefinitely. But right click the link and boom, it syncs!

While I appreciate the features, they are bulky in the sense that sometimes, they get in the way and don't let me take notes quickly. In fact, I have setup a different app(Drafts) on both iPad and iPhone to take notes in Markdown and then save to Evernote, saves me from lot of headache and data is never lost as it is at different places.

Edit: Formatting.