I've been running DA for about 12 years. I had 9 speed triple for 6 (still in use on my spare) and last 6 years with 7800 10 speed. I have averaged +5,000 miles per year in that time, and never had an issue with durability on either group or broken a chain. I am meticulous on lubing/cleaning them, usually lubing every 100 miles with frequent wipedowns. Never taken a chain off to clean, usually do it once a month or as needed with simple green and a good Pedros brush. I get between 4-5000 miles on chain life, 6-7,000 miles on cog sets. As far as chain rings go, on the 9 speed group, I had to replace the middle ring after about 17,000 miles when it developed scallops on the teeth. On the 10 speed group (double), I've just started to notice significant wear on both rings after 20,000 miles on the group.

Your experience seems to be normal. You can't go wrong with using either DA or SRAM.