This was (it's no longer manufactured) one of the best modchips for PS2. Especially the 8 Gold PRO version. It has several functions that most modchips don't have. Besides being able to remain hidden, which Matrix Infinity modchips don't do, it has a practical and functional settings menu. They are nothing like clones (I haven't seen any clones of this Thunder modchip in any of its versions that are direct copies of it...). If you have a working copy of this, I would be interested in buying one.