I like everything about this library, it's easy to use! It has all of my favorite features which is great when you have so many choices in front end frameworks out there - especially with how quickly things are evolving these days (I love that new stuff comes up ALL THE TIME!).
But if something doesn't exist yet as far back-end goes then perhaps not being able too make some customisations might become an issue? That said though we had nothing from what was available at first go around using our own code + CSS/HTML & JS etc., however after going through their documentation more thoroughly maybe having someone else who knows angular do those bits may help us build faster / smoother apps than ourselves without any issues downline?! We're building SPA applications where users want speed over anything fancy or complicated looking; they just don’t care.