"not really good for"
Don't you mean something more like "does not come set up for out of the box"?
The first statement implies "has no potential for, end of story." But in fact there is no stock diatonic harmonica that comes already set up for its full potential.
It may well be that the 1847 has good potential for overdrawing but that the right reed setup is required. Once that is done, its potential may (or may not) be even better than that of harps that come set up for overdraws.
Why doesn't the manufacturer set it up for ODs? Two possible reasons are 1) it would drive up the cost of a harp already made expenseive by the reed material and 2) setting up for ODs may compromise the playability for the average player; even experienced players often attack the high notes too strongly for good response.
The 1847 I have, in G, overblows decently out of the box on Holes 4, 5, and 6, though the OBs bend up gratefully less than a semitone. Holes 1, 2, and 3 are not set up at all for OB, and the overdraws aren't either.
My immediate temptation was to start adjusting it, but I decided to play it stock for a few weeks first, just to get a sense of the harp in its stock condition.
It's a very nice harp. It plays smoothly and fluidly, is very responsive, and has a nice tone.
Jason Ricci tried my stock G briefly and was favorably impressed. This from a guy who is very demanding of his harmonicas, does much of his own harp work, and has a working case full of custom harps from Joe Spiers, Brad Harrison, Richard Sleigh, and others.
Once I decide that it's time to start adjustinf reed action on my 1847, it will be interesting to see what capabilities begin to emerge.