Trex,just a bit of history....2 years ago the whole market was talking crank drive,the combination of the cheap crank drive unit,which I ended up naming the TCM unit plus the cheap Tourney derailleur system was a tempting combination to use,but at the time none of us realised that the combination had shortcomings due to the high chain loads involved.
Even Bosch were caught out by the combined power of crank drive plus rider power and the Shimano Nexus hubs were common failures,until some form of power reduction was developed it was necessary to execute very easy gear changes,Generation 2 Bosch was the result.
Whilst one can specify a technique to alleviate loading on the chain on gear changes it is not something that one can expect customers to follow ,especially if not experienced cyclists.
Hatti....nice couple turned up at our May Redbridge event,they stated that they were generally pleased with their Woosh bikes,taking a view how cheap they were,had upgraded them considerably and had sorted the chain damage problems....no names I am afraid.
Perhaps you might persuade your official (or unofficial) marketing agent named Trex to give a more balanced view on these bikes,he talks as though he is an expert and is your technical consultant but clearly has never ridden a hub BPM motored bike. The result is that this Pedelecs forum is rapidly becoming the Woosh Pedelecs forum and it's hard for customers to get a more wide ranging view on the market in general.
It has pretty much driven away so many of the other traders,who used to make such valuable contribution to this forum. I will admit that Kudos is also getting more than its fair share of promotion but that is only because we seem to have a period where so many Kudos bikes are going out to Pedelecs members.
KudosDave