This appears to be the SDHD but without the side pockets for wood. Those side pockets are made of a perforated metal which appears to do little for the actual structural integrity of the diffuser. So basically this is the SDHD but without the mesh metal for containing wood chunks or sticks.
I can tell you that if this is in fact, just the SDHD but without the side pockets, well then it is as solid as a rock and it is not going to warp like the stock diffuser can on account of the metal being so heavy of a gauge.
I'd buy this in a heartbeat if I didn't already have my SDHD.
I applaud Smoke Daddy for turning the advantage of the SDHD, it's thickness, into a selling point, and skipping the side pockets for wood. In effect making lemonade out of what was in my opinion, a lemon.
The SDHD was a good idea, but as RC Alan above mentions, when burning wood in it, can result in temperature spikes, flames even, which can adversely affect your cook or limit some of the set it and forget it ability that your pellet smoker may afford you.
I think that Smoke Daddy has a potential home run here with this new diffuser as there is definitely a need for it.
I don't even use my stock diffuser anymore, preferring to use the SDHD for all cooks, but without any wood in it. And that's basically what this new diffuser is, or at least, appears to be.
Addendum: This product appears to not be a "new" product, but was one which has been in existence for awhile now. If so, well then I'd recommend skipping the SDHD and just going to it if you're looking for a new diffuser.