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For me, being able to attach/unattach all the light&dinamo&usb system for a "normal ride" its a plus.
I've not actually thought about that (quelle surprise). If I use it as a normal commuter I'll only have one set of wheels so I'll have to leave all that shit on for riding to work on. Fine when I have secure parking but if I move again I won't be leaving £3-4k worth of bike in the street.
For me the PlugIII was a no go because of the installation needed for fitting in into the fork tube, and also the 4S disc doesn't have a hole in the bottom of that tube (hacks will be needed), also read some problems reports.
D1 doesn't have a comparison chart against PlugIII but claims to be more effective than the other options, plus its small enough to be stored anywhere in the bike with waterproofness in mind. But still would be great if you get to compare both in terms of effectiveness.
For me, being able to attach/unattach all the light&dinamo&usb system for a "normal ride" its a plus.