The Alpha 816 was the third generation of Callaway's Gravity Core driver line, built for players who wanted the Alpha's tour-grade adjustability and low, deep CG without stepping up to the low-spin Double Black Diamond variant. It kept the sliding internal Gravity Core weight and added Dual Distance Chambers behind an R*MOTO face designed to keep ball speed high across the face, wrapped in a compact, rounded, matte-black head. Reviewers repeatedly cited it among the best-sounding and best-feeling drivers of 2015-16, a deliberate departure from the metallic 'ping' of earlier Alphas.
Praised in contemporaneous reviews (Plugged In Golf, Golf Monthly, Golfalot) as a standout for feel and adjustability in a strong 2015-16 field, but there is no evidence of sustained collector demand or used-market premium beyond normal depreciation for a two-generation-old Callaway driver.
Good-to-low handicap players who want workability and premium feel from an adjustable driver and are willing to spend fitting time on the Gravity Core weight positions; a high-handicapper prioritizing straight-line forgiveness would be better served by a mainstream game-improvement driver from the same era.
Released in 2015 alongside the lower-spin Big Bertha Alpha 816 Double Black Diamond, competing against TaylorMade's AeroBurner/M1, Titleist 915D2, and Ping G30; succeeded within Callaway's own line by the Great Big Bertha and Epic/Epic Sub Zero drivers.
The R*MOTO face keeps ball speed high on center-ish mis-hits and the Gravity Core adds some off-center stability, but testers found notably steep carry drop-off on low-face and toe strikes compared to true game-improvement heads of the same year — forgiving for a better-player's adjustable driver, not a max-forgiveness club.
Calibrated across the whole catalog — a tour blade scores low here on purpose; it means control, not ease.
Private-party/eBay pricing for the related 816 DBD graded used units runs roughly $130-$165 depending on condition and shaft; the standard 816 typically sits at or below that band given lower demand than the DBD tour variant.
Reading is one thing — hitting is another. Book a bay and see the numbers for yourself before you buy anywhere.