Hi,
I am the person who bought this mixer. I did make a mistake originally as I am fairly new to the Sound Devices line only having owned a 702T and a 442. I was looking at the new 633 and 664 and got them confused with the 552. (I have since done my homework and know a lot more now!) I did ask the seller if I could cancel the transaction. He did not want to do so, which is fine, but when I got the mixer I noticed that not only were the faders rubbery and bouncy as described in this thread, the second fader was not rubbery (seemed normal like my 442,) which bothered me since the feel was inconsistent from fader to fader. None of this was described in the ad. When I brought the mixer to Trew Audio (Coffey Sound) and asked the technician, he said the rubberiness was not normal and would require $250 to fix. That's when I opened a case against the seller, asking him to pay for the repairs. I honestly did not know at this point that the 552 originally shipped this way, but even so, the inconsistency between the feel of the faders was not mentioned in the ad and I felt this was a significant issue. Anyway, I shipped it back and Chris refunded my money so all is well. I hope that he has success in finding another buyer, but I recommend he clearly describes the situation with the faders. I agree that having SD check it out and fix this and any other possible issues before selling will give it a higher value and make for a happy future buyer!