HiFiChris has a review of the Titan 3 on Head-Fi. Included in the review is a comparison with the Titan 1 as well as Titan 5.
In summary, “Out of the Titan series, the Titan 3 is the most balanced sounding in-ear. It also has got a high resolution with a fast and punchy as well as arid bass and a convincing spatial presentation.
Here is actually really nothing to criticise from my side and the Titan 3 scores easy 5 out of 5 possible stars in my rating”