Howdy Yonkyo, and welcome!
I have the flat-grind version of the #1 (also known as the Large Camper) and a flat-grind #4 Survival, both in 'high-carbon stainless.' The #1 is one of my most favorite knives. I find it extremely comfortable to use. As Rigson mentioned, it is a great knife for chores and small jobs around camp, cleaning game, whittling, etc. Personally, I wouldn't baton it to split kindling unless I absolutely had to. The flat-grind #1, although decently thick at the spine for a knife of its size, does seem less fragile than the saber-grind version.
I believe all of the Grohmann DH Russell knives are fantastic. I don't think you'd be disappointed with a #1 or any other knife from the line. At first i thought the shape of the #1 was a little odd, but once I had it in my hand, it really clicked and felt so right. I can't think of another knife in my collection that felt that great when I first handled it.