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My Urban Arrow came with an Enviolo. First one lasted about 9 months, second was better (but not much). They come with a 2yr warranty. Now on the 4th one since 2019 (not under warranty). It's the latest HD version so I'm hoping it's better ... time will tell. I was prepared to fork out for a Rohloff but it was going to mean being without my work-bike for too long so it's fingers crossed
S10 but I'd suggest HSD if home maintenance is important; no internal cables
Belt + nexus/alfine 8 makes more sense than enviolo