I'm totally pleased with my BMC hub.
I looked at a bunch of different options before I purchaced & from what I discovered , the BMC is top notch. There's a video on youtube in which 2 ebikers with comparable systems had a short race & the BMC wins hands down.
http://www.youtube.com/watch?v=nGoLMGPPwow
There is some concern with the longevity of the BMC , but I run the exact setup they talk about & have hundreds of miles on my righ with no issues yet & I'm also about 250ish lbs.