I like using it because its extremely easy for beginners, you don't have too many options when configuring your compose file; so even if something goes wrong or isn´t very clear in documentation - everything works well! It's not free which can be expensive depending of how big are projects that use this software but considering what i get from kubernets compared other products (ease) then no problem here :) The best thing about composse files as far as me was concerned were their simplicity and ease usage/configuration process without having any problems after years still today ;).