The key feature that I like most about this product it self was its ability to encrypt my data at rest without any hassle in terms of managing keys or having them stored somewhere else. There were also few issues regarding application compatibility but those can be resolved by using some other products as well such as AWS Key Management Service (KMS). Overall experience has been good so far. But there could have been more customization options available if you're not happy with what they provide out of box. We used to store our customer's API secrets within the vault itself along with passwords etc.