I like my 3 speed SA hubs for their simplicity, their perfect shifting and the fact they have nothing to dangle down and catch up road filth. I like the range of an 8 speed derailleur and its lightness. I have never used a belt drive but the theory seems sound. It would be interesting to have a test of 2 identical bikes, one with belt and IGH and another with an 8 speed derailleur subjected to a lengthy test with a lot of abuse...rain, snow, sub zero temps, good roads and bad, etc and see which works best after 10,000 miles or more.