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I am finding them less convenient - you see that someone is replying to someone else and then have to click the name if you want to make sense of the reply. Or you just skim over it and don't bother.
Actually links not opening in separate tabs is a bit annoying too.
On the other hand if people are dissuaded from quoting long posts or bunches of photos then that's a good thing.
WillMelling-
I am finding them less convenient - you see that someone is replying to someone else and then have to click the post number or whatever if you want to make sense of the reply. Or you just skim over it and don't bother.
Actually links not opening in separate tabs is a bit annoying too.
On the other hand if people are dissuaded from quoting long posts or bunches of photos then that's a good thing.Just highlight the text when you press reply then
Mule 
Because replies are better they tell the person you're replying to their post