Yes definitely agree, I own the Rotring 600 and 800 pencil and they are fantastic, as already said the ballpoint version is dependant on the refill. The construction is sturdy and they feel very robust and heavy.
But... I've recently transitioned to Pilot Capless fountain pen and it's night and day with the write feeling: https://www.pilotpen.eu/our-products/capless/ with ink bottle refill. The nib size is important, I found the medium too large and landed on the fine nib size.