Shimano's Ultegra 10-Speed Cassette delivers pro-level shifting and durability. The computer-enhanced tooth shapes and tough cogs mean you can shift quickly, precisely and smoothly even under pressure.
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Using the 12-25T for 30-100+ km rides and regular commuting this cassette has held up very well over the last 3000+ kms. Shifting is smooth, quiet and precise. It's just a bit more refined than my 5700 12-27T. If I couldn't find the 6700 on sale I may opt for the 5700 to save some money without sacrificing much in terms of quality and performance.