Park Falls, I have that particular TBow from Amazon. I have not compared it against any other or earlier version, but I doubt it's machined. I think it's probably false advertising.
I think the Tbow riser is quite nice. I bought it as an affordable entry point back into archery. For that, I think it's great. It does have issues. I bought two of those Amazon bows and kept one. Both lacked set screws for the limb alignment system. Without set screws, the limb alignment screws were continually vibrating loose and needed re-tightening during the middle of shooting. Very annoying, but easily solved by getting some short set screws from Ace and putting them in behind the limb alignment screws.
The tiller bolts also don't seem to lock properly, despite the presence of set screws here. They need to be tightened all the time as well. (Possible I'm just not tightening them hard enough, but I'm leary of using much force as I've read tales of people stripping these bolts out.
But despite these problems, and even if we assume it's cast aluminum, the riser is quite nice for the price. Maybe the best deal going.
There are quite a few old, very long threads on this board about the Tbow and it's origins. Having read all of them before buying mine, I happen to think there is a reasonably good chance that Junxing was making Satoris, possible even casting them, in the early days of the riser's existence. For a very long time, Hoyt refused to respond to inquiries about where the Satori was made, what it was made of, and whether it was machined. Then, all of a sudden, they told someone from this board on the phone, that the Satori was machined in the USA. Right around that time, the Satori changed shape - losing the little flanges flanking the sides of the limb butts - and acquired a "Made in the USA" stamp or engraving. Some suggested that these little flanges would be a pain to machine and so they were removed from the design when they began to machine the riser.
Another clue is found in this article written by a guy who says he helped design the Satori:
Hoyt Satori Recurve Review - Rokslide
A short way into that review, we find this photo:
View attachment 40534
I could be wrong, but I don't think Hoyt ever sold the Satori with that laminated wood grip. This is the only photo in which this handle appears, as far as I know. Where did it come from?
This is the grip of the Tbow:
View attachment 40535
Maybe Junxing made the early Tbows and was originally going to also supply laminated wood grip, but Hoyt rejected the grip and went with a solid wood one.
So my hypothesis is that the Satori was originally cast in China by Junxing. Later, in response to public scrutiny, Hoyt began machining Satoris in the USA. Meanwhile, Junxing had a bunch of the risers in their possession, and put them into the Chinese domestic market, from whence they leaked into foreign markets via Alibaba and from there onto various online retail outlets like Amazon, Aliexpress and eBay. Whether the risers Junxing had were identical to the early Satoris is unknown.
Possibly they were an unauthorized/pirate production from the same factory, maybe using inferior aluminum. Or maybe they were from the actual Satori production line, but were factory seconds - they failed QC for some reason - that someone at the factory smuggled out the back door, which is a very common practice in China.
If any of this is correct, a big question would be why Junxing would jeopardize their relationship with Hoyt by doing any of this pirated activity.
And then there is this: Junxing's most recent Hoyt ripoff,
a copy of the Xceed 25" ILF riser. Junxing (or whomever sells these things) originally called the Satori clone the "Tbow H1"; this Xceed copy is being marketed as the "Tbow H7"
Of course, I could be totally wrong about most of this. It's possible that Junxing has no formal relationship with Hoyt and that they just reverse engineered the Satori and now the Xceed.
In any case, the Satori-clone Junxing H1 is sold with 60 pound limbs and I've never heard of a failure. It's quite possible that Junxing simply looked at the Satori when it first came out, noticed that it was quite a chunky design - overbuilt - and figured that the design would be plenty strong enough with a simple cast. Why machine it when a cast is strong enough?
So, bottom line, in my opinion, is that the TBows being sold now are just fine, but are probably cast from aluminum of unknown quality. The paint job is weak and will chip. The limb alignment screws need set screws. The tiller bolts will probably loosen on 'ya. The laminated grip is nice looking but kind of huge and will probably need replacing.
The Tbow riser can be had for around $90 on aliexpress, although it is usually sold for around $125 on eBay. For only $50-100 more, there are a number of risers (e.g. W&W Black Elk) that are maybe better quality and better deals, and don't require that one get wrapped up in some international piratical mystery.