Has to be better than super heavy dinner plate cassettes and the extra chain links required to use them. Internal planetary gears, sealed from the outside world, just leaves you the derailleur to clean. Time will tell on specifics and pricing though.The workings must weigh more than a front mech and an additional chainring
Plus repairs and servicing is harder plus it adds another permutation into buying new wheels
I'll be sticking with freewheels on my road bikes and shim cass on my mtb.Yet another cassette standard. I'll pass.