rsvman I used to game the Alpha 830.2 and now I'm gaming an older 919. Come to think of it they do have a similar sound and feel. More "solid" feeling than the OEM drivers I've hit. Guess it's the SP700 that gives it that wonderful feel.
That's exactly what it is, a better sound and feel at impact. It's somewhat of an intangible which makes it hard for manufacturers to market it or justify spending extra money on it when most golfers either 1) don't know about the difference, 2) won't notice the difference, or 3) they just don't care. That's why SP700-faced drivers have all but gone the way of the dinosaurs. If you google "SP700 golf driver" and limit your search to the last 5 years, the only new models that show up are the Titleist C16, Tour Edge Exotics XJ1, Fister Beast Model 1, and 3 Japanese models which are all $500+ per head. So only 6 drivers total, only 3 of which were sold in the U.S, and only 2 of which are made by major OEM's - and they carry price tags of $1,000 & $600. SMH. And the last few OEM heads I know of before that were the Titleist 907 D1/D2 and the original Tour Edge Exotics from 10-12 years ago.
But, you're in luck if you want a Fister Beast 1 because you can snag those heads on eBay for $75! It actually looks like a pretty decent design, in fact quite similar in shape and profile to the 919THI, and it stacked up really well in a review done by MyGolfSpy: https://www.mygolfspy.com/ultimate-review-fister-model-l-driver/. It ranked as the #5 driver in overall performance for that year (based on distance, accuracy, & consistency), beating out the likes of Titleist 913, Ping G25, Callaway RAZR Fit, Geek No Brainer, and - coming full circle to the get back on topic - the Wishon 919.