What's also not noticed unfortunately before buying: the 8 drill is extremely short. Only 100mm instead of 120mm as the standard 8-bit. Holes for dowels 8x80er (eg Fischer SXR) or even 8x90 (Tox biceps) you get so not bored. With nem normal 8-drill at least go the former. Hab fortunately still the Heller Allmat that go at least in neat brick still pure and have normal length.
After the first anger is gone, I have tried them anyway times. Go well in concrete, even with the battery impact wrench. I still can not provide long-term experience