Yep, I rode some Haibike SDUROs today. Agreed, very quiet! Compared to some of the higher-end XDUROs I've ridden at Motostrano, the SDURO Cross SM's shifting wasn't as precise, but then again, it's a much less expensive bike, so that can be forgiven, and its shifter cable tension may not even have been adjusted properly to begin with, so who knows. The SDUROs seemed to offer some good acceleration on the test track, but then again, you can't really get going any faster than 19MPH or so on the test track, so it's hard to tell how it would perform in other scenarios. I look forward to spending more time with an SDURO soon.
I took an SDURO over the offroad bumpy section of the test track and promptly almost fell off. Note to self: avoid MTB sections. ;-)
I'm really hoping some of Haibike's off road models (either sduro or xduro) will be speed pedalec. I've heard rumors this is the case. Can anyone confirm? I'd love to know specs and release date!