Granted, this product isn't for "serious" cyclists, but it wasn't intended to be. For every one of us that would like to see data comparing efficiency losses vs a triple crank, there are probably hundreds of potential users who really don't care, so long as it doesn't feel like they're dragging a box of rocks behind them. It's intended for commuter bikes, city bikes, and casual riders, not serious touring or competition. Thinking of my bikes with IGHs, and times I've loaded down a rear rack, I tend to feel weight a lot more over/in the rear wheel than under or in front of me, so a light, SS wheel with one of these up front might be a very pleasant combination. As was mentioned earlier, the 28 tooth equivalent ratio is too low for most if not all IGHs, and the Efneo site says that. They recommend this crankset for derailleur and SS (freewheel, not fixie) bikes, as a replacement for front derailleur rigs and to add useable gears to SS bikes without resorting to an IGH wheel.