Well, I was once like you are now, also wondering why folks were foolish enough to pay so much cash for parts.
Now I own an XTR rear derailler with an LX front.
The LX is a vast improvement over the original Deore, and the XTR is a noticeable improvement over the LX that was on there for a 18 months (it wore out).
And a good test is to do this.
Go find a hill, nothing big and scary, just an incline.
Start pedalling up said hill.
Now, without backing off the pedals and using enough power to continue moving, change gears. Either front or rear doesn't really matter.
One of two thing are very likely to happen with yer Alivio. 1 it wont shift. It will just make a grating noise. 2 the derailler will go pop.
And there's the difference. I can shift under full power (in fact the shifting seems to improve under power) up hill, down dale. Even Deore couldn't quite manage that, and the LX was not as quick and crisp as the XTR is.
Would I buy XTR in the future? Maybe, I don't know till I get there.
Am I happy with it? Yes, but an XT prolly would have been fine too.
Ok?
