I like how it's easy to use, has great support for R-Studio (which makes training data sets super simple), allows you train models with many different types of features in one interface - very powerful! It also provides an API so we can integrate their library into our applications without any hassle or coding required from us at all :) There are some things which could make sigopt better but nothing majorly bad either way :). We're using this package as part of creating predictive analytics tools within healthcare companies where accuracy matters quite heavily!!