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The biggest problems with the use of torsion bars in F1 currently (according to a couple of "inside" sources) is longevity (one race), and some strange harmonics. These 2 problems are primarily due to the extremely short nature of the current bars.
Because of packaging problems, the length of the bars are kept really short - about 6-7 inches overall. The diameter is also small to get the rates desired, but the angle of twist is high, causing premature fatigue. The diameter, and the surface finish, is critical, as a .002 diameter change is significant. Any surface roughness will decrease the life expectancy significantly.
So far, the materials tried aren't really different than what has been used for coil springs, but experiments are being performed on alternatives.
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