Black Mamba, just as all the other coasters in Phantasialand (Taron going to be the exception) have practically zero airtime. The only point on any of the coasters I remember is the second drop of Colorado Adventure when you enter the dark part, but then again it only lasts like a second. Black Mamba is all about intensity and positive G-forces (i.e. you're pressed into the seat, basically anti-airtime). If you're up for an intense ride, go for it. I'm pretty sure you can try Colorado as well, it's a really great ride and considered a family coaster, so better give it a go.
That being said, this is hardly the right thread for these affairs (Edit: Sorry, of course it's the right thread, I was so used to reading Taron-related stuff in here I was certain this was a Klugheim thread, my bad!). Have fun though, enjoy your stay at the park.