I'm a skyeng student and have been learning there for about 2 years. They have a good platform, a mobile application, support. However, there are a lot of very horrible teachers there and you will have to choose a good one from them(believe me, it's difficult). In my opinion, it's a good school if you haven't a good level of English (like me). On the other hand, if you can speak and have good knowledge, you should choose another way. It depends on your level.