I'm a huge fan of Literal! I've been looking for a way to move off of Goodreads for years, mostly because I'm convinced it hasn't been updated since I started using it in 2007.
Literal had all the features I want - easy import of my Goodreads books, a great API, and a way to embed what I've recently read on my own website (at one pointed I'd written my own script to do this, but this was far easier).
It's also really cool to be able to see who has decided to read a book based on your recommendation.
It's very smooth to use compared to Goodreads. However, it's unclear how it's helping us discover new books to read - the recommendation isn't as robust and when asked to recommend, it takes you to one specific book and there is no way to ask for more.
I've been using Literal as my main books tracker for about a year, and it's been amazing. An excellent Goodreads replacement, I use it weekly to ensure I track my book reading, keep up with friends reading, capture good quotes, etc. The feature set keeps growing and my shelves are always cleanly organized. Love the product and the team!