The ease of use, its ability to scale up or down as needed is amazing! If you have an issue with one server it can be fixed in minutes rather than hours/days like other products out there that don't offer this much flexibility for troubleshooting issues when they arise (or not!).
We've been able solve some very complex problems using cloudians global features without having dedicated engineers working around-the clock at our site - which was key since we were solving such complicated engineering challenges within AWS infrastructure where downtime could cost millions per hour!! I believe their support teams are top notch but if something goes wrong during your trial period then contact them immediately because after 30 days all subscriptions expire unless otherwise stated by contract terms so make sure things work before committing long term contracts. Have used S3 bucket storage capabilities; EC2 instances running various micro services including Lambda functions etc.; ELB load balancing across multiple availability.