My sister and I went at the end of May. We bought tickets on the internet before and it gives you an entry time frame of one hour, but you can stay as long as you like. The ticket we bought include the guided tour which is only in English one time per day (I think it was at 1:00). If you buy online you just show up at your entry time (no need to wait in any lines).
We both really liked the tour, you do get shuffled around a bit, but after the tour you can reexplore at your own pace.
They talked about how the style and mood of his paintings changed. It was good to know what events were going on in his life when he painted certain works. We also learned some general things to look for in paintings which was good 'cause we're newbie art goers.
I don't know how good the audio tours are.