I think it's kind of luck of the draw. I have not had a bad experience so far, but I did have a good experience a few years back when I brought all of my instruments. I walked through aduana with a cart loaded chest-high, containing, among other things, my bass guitar, electric guitar, acoustic guitar, a fairly high-end midi keyboard controller, a USB external analogue to digital converter, an external USB drive, a couple extra SATA drives, a good asus motherboard, my cell phone, various, cables, etc, you get the picture. Mind you this was all fairly obviously used stuff, much of which I've had for over a decade, and showing the corresponding signs of wear. The cool thing was, I started loading it onto the conveyor, and the guy asked me where I was from, I said the US, and handed him my passport, mentioning that I like to play music. He just waved me through saying, oh, go on, have a nice visit, only putting maybe one guitar though the scanner and everything else stayed on the cart. My impression is that there is likely a huge difference between electronics that convincingly appear to be for personal use as opposed to stuff that is obviously new, with the worst case scenario being new in the box.