Quote Originally Posted by liza View Post
I've read anecdotal reports that the lower groups (below 105) are less durable and reliable, though I have no personal experience to verify that. There are significant weight differences and that's a lot of what you pay for honestly.
My Giant is Sora-equipped. I love the bike but Sora is no good. The shifting was, to put it nicely, less than fun. I have an all 105-equipped bike and the difference is like night and day. It shifts like buttah, baby, buttah. Spend the extra money if you can.