I can get them for about 60 bucks. Are they worth it?

The title is self-explanatory.

Have you heard them? What do you think about those?

I want to sell some CDs I no longer want in my collection. However, I used them a lot and they got scratched over time. How do I check if they play without skipping or any losses without actually listening to them one by one?   Do you know of any software that could check the CDs for me?

Since I bought AKG K412Ps I've been planning to buy one of the cheaper USB DACs (two most interesting to me being FiiO e7 and Audinst HUD-MX1) - I thought that since I have headphones that one could call "not bad" (even though they're just portable ones) I now could improve on the sound by...

I bought these used and received them today. Can owners of real K412Ps compare theirs with mine? Here are photos with things that I think might matter, such as the shape of the plug, the look of a speaker etc, I had to edit the colors (setting the white balance in my camera was tricky at this...

The title is pretty much the essence in this case. Can you buy fake Porta Pros? K412Ps? K420s? HD201s? And are there any guides on the internet teaching how to tell if headphones are fake? Some general rules?

At first I thought I'd buy the AKG K420s but since I've come across the Philips SHP5401s (as far as I know they are the same as SHP5400s only in a different color, at least they look nearly the same) I don't know which ones to choose. SHP5401s are said to be surprisingly good for the price but...