I have been using Instaread for a couple of months...

I have been using Instaread for a couple of months now and I must say it's been a great experience. The summaries are concise yet comprehensive, making it easy for me to grasp the key concepts of each book. The rate at which they add new titles is also impressive. The only downside I can think of is that sometimes the app can be a bit slow, but overall it's an excellent service.