uh oh... should we duck and take cover again?
For real though, the only thing I know for sure about sales is what I just read about sales in Japan, that the DS has sold total about 1.8 million units specifically in Japan. The PSP has sold just over 1 million units in Japan so far. This last week (or was it month? I can't remember!) was the first time the PSP sold more units in that given time period than the DS... before that the DS was consistently ahead in sales up until that point. So the PSP is starting to catch up but still significantly behind... 800,000 units lead is nothing to sneeze at.
If this is true (the source was Gamespot.com if I remember right, so I suspect it is), then it makes sense that the DS may have sold 5 million units worldwide by now. I'm pretty sure last numbers I heard for US sales was in the 1 or 2 million range.
About what the guy told you about people returning PSP's... he must be referring to the fact that so many people had had problems with defects and were wanting to exchange them, which was very true... lot of people just can't stand dead pixels
As far as people trading PSP's in though, I started a thread the other day commenting on how I walked into a local game store and saw a lot of used DS's which had been traded in for sale, but no used PSP's as of yet. Of course, the DS has been out about four months longer so this doesn't really say anything about people like one or the other better. So no one get all pissed off please for me posting this!!