I really like how Shimano shifts, especially the double up-shift. I don't like how you have to grease the clutch so often, but to be fair it's super easy. I had to add blue loctite to keep the XTR B-screw from backing out, but again to be fair my X01 felt like it needed retuning every 4 months or so also.
I've had durability issues on both X01 and XTR cassettes. When I first got Eagle, I had a tooth snap off the 50 cog within 400 miles, and I'm not fat or particularly strong. SRAM warrantied it but made me go through the store I ordered it from, who in turn made me go through their local shop which was a headache but eventually got done. After that I put on about 2000 miles and the cassette is still in pretty good shape. I recently swapped over to XTR and I just yesterday found that one of the teeth has snapped off the 3rd largest black cog, after <180 miles. I've already reached out to Colorado Cyclist for warranty help on that because that's just nuts.
I've had durability issues on both X01 and XTR cassettes. When I first got Eagle, I had a tooth snap off the 50 cog within 400 miles, and I'm not fat or particularly strong. SRAM warrantied it but made me go through the store I ordered it from, who in turn made me go through their local shop which was a headache but eventually got done. After that I put on about 2000 miles and the cassette is still in pretty good shape. I recently swapped over to XTR and I just yesterday found that one of the teeth has snapped off the 3rd largest black cog, after <180 miles. I've already reached out to Colorado Cyclist for warranty help on that because that's just nuts.