Further update on my Skarper experience after I've done a couple of 20-mile commutes.
My commute is mostly flat with a couple of relatively easy hills. For the hills the Skarper does exactly what's expected - it gives that bit of help to get up them more easily. I find I go uphill doing 10mph very easily. Now here in the UK, e-bike motors are restricted to provide support to 25kph (about 15.5mph). This appears to be my typical speed on the Q45 though so I tend not to get any or hardly any support from the engine. The funny bit is that if I stay just under the 25kph I get support and it runs very easily, so much so that I want to change gear. However when I do that, I go past the 25kph at which point the motor cuts out, so I have to shift down again.
But apart from that I am very happy with this solution. I still get a good workout (some 2 1/5 hour on the bike) and I am not totally shattered by the time I get to work. Win-win. As for battery usage, I use about 50% each way so I can make it there and back on one charge - just about. It might be different if I have strong headwinds in one direction though - I haven't had that as yet.
To answer
@llavalle - the solution that I got from Skarper is not the standard solution but it is basically doubling up on the strap that comes as standard.
@Robert Holler Skarper will come to the Taipei Cycle where they will try to link up with you.