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Good stuff.
Nexus 5 is new so as yet fairly unproven, but looking at tech docs the internals are generally a lot beefier than the Alfine 8 and 11 (known to break when used with a mid drive, especially if not treated nicely). So far no one has broken one that I know of (and people I know break everything always).
Nexus 5 di2 supports auto shifting, and it also has little ramps, almost like synchromesh on the faces so will allow a certain number of full power/torque upshifts (before they wear I guess?) . You can turn off auto shift, I quite like it now you have more control over it, the earlier version of it not so much.
Main reason for less gears is those using an ecargo bike in town tend to not need super close ratio gears as your making more use of the motors range.
Personally prefer regular derailleur gears, only use about 4 of the 11 with the motor on, with tthe motor off, yeah you need that dinner plate XT cassette to get things moving.
No I'm in the states.
Was advised against Nexus 5 by a sales person who made only half sense to me. Something about automatic gears, which I couldn't care less about. Still, I went with Di2 XT based on the following: my own familiarity with a mech, the suspicion that the Nexus may not be up to the task.... and that I'm really interested in owning am electronic system. What better platform than this? It's got a huge battery already
They had the e6000 bike on sale but what I read made the e6100 seems so superior, that it was a no-brainer
I'm pumped.