M L.

Definitely don't pay for a premium subscription. I took the Japanese course through the beginning intermediate level. The grammar gets progressively worse, to the point where the statements are inherently incorrect. Somewhere around the middle of the second beginning level, programming bugs began to appear. The drag and drop didn't, and on more than several occasions, the dialogue wouldn't even load.

Don't bother to try and get it fixed. Busuu didn't fix it, and then sent me a message saying that since I hadn't contacted them in a week (why would I?), they would close the ticket. I mentioned that there is nowhere to report errors and the customer service agent (and I kid you not) said that's because they have so many errors they aren't accepting any more at this time.

Even for free, there are countless better options for learning a foreign language.