I have the Carpenter.
I bought it soley because Ragnar (Ragweed Forge) highly suggested it.
Great knife: mine came extremely sharp out of the box. It is a delight to use and the Birch handles are smooth as satin. I wasn't too sure when I first received it, as the handle seemed a tad small for my X-large hands. My concern was unwarranted though, as the contour of the handles fits perfectly in the palm of my hand and helps give me precise control over the blade. It really shines when carving wood.
I don't have the Grandfather knife, so I can't give you a comparison between the two. I really like the version with the wooden sheath though - there's just something about it.
Everything I've read about Roselli knives has been positive. My own experience is the same.