It's easy to use, it has all required features that you need for your business needs, nothing much at this point but I believe they are working hard with their customers feedbacks in order to improve everything about their product.
The UI could be better so more people can understand how things work without having any technical background or experience. We have been using Hcube as our primary ETL tool since we started running several microservices applications which require frequent data extractions from multiple sources like Kafka/Kinesis etc.