I think there is a sweet spot where quality, durability and value come together. For me (I'm a Shimano guy) Alivio has been a good workhorse group that I highly recommend for a MTB, commuter, or tourist on a budget. For my old steel bikes Deore and LX derailleurs, shifters, and brakes along with Alivio cranksets have served me very well. For my road bike, I'm very happy with modern 105 and can't even complain about my Tektro brakes or FSA crankset.