The BT RH 1500 came the next day
I still have another hole drilled with 12mm drill 12 seconds, and then again with 20mm drilling seven seconds. Wow, may be that there is still more powerful rotary hammers, but that's enough for me anyway.
Have expected to improve, but so fix a surprise was that it
For home use, therefore full marks as durable the device is I can not say. For the professional needs it has also not built.