Originally Posted by
Wanderer
Higher quality is always higher quality. But, almost all Shimano stuff works well, and as designed.
All Deore stuff is high quality, and will work very well. You should be very happy with Deore components.
Higher quality (higher levels in their product line) might shift smoother, and faster. But, in all honesty, most of us will never notice a difference.
Keeping components clean, properly adjusted, and lubricated, will make all the difference in the world to you. You will notice that difference.
+1!
I have the Trek 7.4FX which has a Deore rear derailleur, and it is wonderful. Also, if you look at the Shimano mountain gearing hierarchy you'll see:
XTR (10)
Saint (9)
Deore XT (9/10)
SLX (9/10)
Zee (10)
Hone (9)
Deore LX (9)
Deore (9/10)
Alivio (8/9)
Acera (8)
Altus (8)
Tourney (8)
Obviously then, with Tourney on the bottom, Deore is in no way "garbage" or low end.
Also, as one or two others posted, plenty of people have gotten excellent service from Acera and Alivio, and even Altus. As Wanderer stated, keeping your bike and its components properly maintained is key.
Meanwhile, just ride and enjoy!
Best regards