Awesome Possumwrote a review of SRAM Force XG-1270 12-Speed Cassette on April 21, 2019
Familiarity: I've used it once or twice and have initial impressions
I used a LBS mechanics bike for a couple days as he was encouraging me to upgrade to Force Etap AXS. It had the 10-33 cassette. The cog spacing is poorly planned for recreational users who ride more on the easier cogs than the harder ones. The cassette is 10-11-12-13-14-15-17-19-21-24-28-33. SRAM promotes the single tooth jumps from 10 to 15, but these are the least used cogs for recreational riders. Riders now have even larger jumps than before among the easiest cogs: 24-28 is 4 teeth and 28-33 is 5 teeth. Compare this to the PG-1170 11-32 cassette: 11-12-13-14-15-17-19-22-25-28-32. So, 11-speed already had single tooth jumps for the five hardest cogs, BUT the easiest cogs were 3 or 4 tooth spacing at 22-25-28-32. With a 46/33 crankset in particular, I'd prefer smaller cog jumps at the easy end: 21-24-27-30-33. That would mean more choices and smoother transitions at both ends of the cassette. (To be clear, I'd make it 10-11-12-13-15-17-19-21-24-27-30-33). Cassette is well made, fairly light, looks good, works well with proprietary chain ($35 here at CC). Overall, SRAM improved the shifting but made riding at the easy end of the cassette less smooth, which is were recreational riders will spend most of their time.