I lot of folk think they're stronger and more reliable than the SRAM Dualdrive which is very similar but more flashy. I think a lot folk won't go near the SA brand.. They're just brand snobs. I've got one in my spares which I got to replace a broken SRAM hub. However, soon after buying on eBay I was given a wheel with a SRAM Dualdrive hub, so I took the easy option and never got round to trying the SA hub. I had the DualDrive on my previous trike giving 81 gear combinations with a triple and a 9 speed cassette, which this hub can match, but there was a lot of overlap. However, the range was still massive.