Pilotest is a very good preparation for the Pilapt. There are a few extra tests that are presented in the pilotest Pilapt preparation and that are not part of the real Pilapt tests series.
I spent about 100 hours on pilotest and then I passed the Pilapt with a very good score.
The only thing I would reproach is that you need an internet connection (you can't play offline...)