The Rd270 combo works out to be over 100g lighter.
Has anyone used this combo and compared it to a tried and trusted dt240+sapim combo? How does it perform in comparison?
I dont think anyone has enough mileage rd270 combo to really know regarding reliability. The magic of the dt240 hubs is that they just keep running. I think the rd270 based wheels are about $1000?
I personally think they are a great option for a light weight build and bragging rights, but the old dt240 or the current 350 would be what I would get and in that price range spend a little more get some rims with actual aero credentials to make up any potential performance gap based on weight.
All my wheels run either the older 240 or the newer versions of the 350 and if / when the bearings go they will all get the 240 bearings but its a theoretical conversation because despite clocking over 20,000 gravel miles and seeing a pressure washer a couple times a month, my most used set still doesn't need anything more a hub regrease every 6 months.
You can find experiences with the rd270 over on weightweenies here
https://weightweenies.starbike.com/forum/viewtopic.php?f=132&t=156164&start=2490