There is, but the new cheap stuff is actually pretty good, there's a lot of tooling, experience and technology from the older more expensive stuff that gets used and they just blast out more of them, as you say tolerances are a bit slacker. Set up properly I think most people would be hard pushed to notice a difference between that new acera and an XT M772 or similar, the XT would weigh less and probably last longer, but good luck finding one. The new acera is nicer shifting than the older non shadow XTs too, although comparing new to new is difficult.
There is, but the new cheap stuff is actually pretty good, there's a lot of tooling, experience and technology from the older more expensive stuff that gets used and they just blast out more of them, as you say tolerances are a bit slacker. Set up properly I think most people would be hard pushed to notice a difference between that new acera and an XT M772 or similar, the XT would weigh less and probably last longer, but good luck finding one. The new acera is nicer shifting than the older non shadow XTs too, although comparing new to new is difficult.