Is anyone on this forum a member of Air Berlin's frequent flyer programme?

Is anyone on this forum a member of Air Berlin's frequent flyer programme? Could you please share your thoughts and experiences.

I am in Top Bonus. I have barely a few thousand points, however. About all I can say is that they are one of the seemingly few programmes nowadays to send you a physical card before you have even earned points. Flying on their affiliate Niki (previously owned by Austrian Niki Lauda, he of another prior airline in Star Alliance, Lauda) I figured I'd better join to have flights with them credited. It's fun flying Niki - near new planes, attractive and haughty (I like a bit of German and/or Austrian haughtiness) FAs in jeans.

Have had it for the last few years in case I turned from the dark OneWorld side and went back to the Star light, although I would more than likely want to fudge status quickly if that occurred, meaning I would do so via Aegean's programme.