Are either of these PS2s problematic with playing backups?

[Flak Beard]

I have a slim (SCPH-70012) and a fat (SCPH-39001) model I can use. Which would be the better choice? I've heard some models are susceptible to laser damage.

[Mozgus]

The first few slim models have short lifespan laser units, so if you buy one, I highly suggest buying a fix chip. its very easy to install as long as you know how to solder. It's nothing but a deck of resistors.

http://www.mod-chip.bz/catalog/laserfix ... a71320b39d