Named after the most famous artillery piece used during World War I – a cannon., the Original Big Bertha was called the "World’s Friendliest Driver" and was the first widebody driver made of stainless steel. Introduced in 1991, the Big Bertha utilized Callaway's breakthrough design S2H2, Callaway Golf designers were able to shorten the traditional hosel length, which allowed weight to be moved lower and to the more useful perimeter area of the clubhead.
The Callaway FT OptiForce driver is a 2013 mid-season release for Callaway. They boast it as lighter and longer. In a year that saw probably the best success in Callaway drivers, the need for a 3rd driver that looks much like old Callaway models is well... odd. None the less Callaway deemed it necessary.
Pros of the X Hot Pro Driver: 435cc club head is ideal for workability, thin wall casting creates a hot feel off the face, speed frame face created more ball speed.
Cons of the X Hot Pro Driver: Shaft is .75" too long (for me), optifit tech doesn't adjust loft, the new grip had a tendency to slip in hotter temperatures. No alignment markings on the crown.
The Callaway Diablo Octane driver does have a sleek look to it. I tested the Diablo Octane Tour as well as the regular Diablo Octane. Callaway designed a nice, simple looking club head here. The Octane is a bit on the large size for me, with a 460 cc head, but the Diablo Octane Tour is a little smaller at 450cc.
At the start of Club Wars, this driver was one of the early favorites. After testing it, we really enjoyed it. Even though Callaway is a bit behind the 8 ball with adjustability, it was well worth the wait. Callaway’s Optifit Adjustment system is definitely something that was worth the wait because the ease of adjustability makes the club very versatile for all different swing types. The small club head produces a nice launch and a low spin trajectory, which is exactly what a lower handicap player is looking for in a driver.