They are decently stiff underfoot and a little softer in the tips and tails. I would classify them as a mid stiff.
They are ABSURDLY light and full of pop and energy. Owned 3 pairs, ski 99% park and have never blown an edge compared to my old rossis which are missing a foot and a half. Real durable
At 178 they are a little long on turn radius so they'll be a little slow at center mount. That's where I mounted mine and they still slay, just don't expect to be whipping tight carving turns. Bamboo is what makes the ski unbelievably light, but it does lose some energy and rebound over the course of the year. Overall though the benefits of bamboo undoubtedly outweigh the life span...
Good luck wit yo descision