Well I have been learning French on busuu for six months as a free member. I am so limited there, because i do not have access to the grammar parts( that I use books for that), and I can not record my voice for my friends to correct my pronunciation. But ever since it has improved my writing and vocabulary a lot. My listening comprehension still is far from perfect. I write alot which are corrected by native frenchs and I talk to them online which is also helpful.
But I wish busuu could block all the guys who seek sex chat there. They drive you maaad!