By the consumer. One of my friends bought the PS2 three times ! cuz of the the QC issues. My bad experience with it, I sold most of my PS stuff, even some of the items where factory sealed and because of the QC. Yes even it had the worst D-button (broke a few of them), my friend got PSP Gradius Portable, he said its better to play it with the analog stick.
The only thing I have and play on it is my GBA-SP and I`m planning to get a NDS-Lite and of course the NR.