boss chip

[210 dsm]

i found a product on ebay thats called ''the boss". is a little chip in a black box with two wires coming out of it. i was just wanting to know if there is anybody out there who has first hand used one and what did they think? Im thinking of getting it for my 4G37 motor.

http://cgi.ebay.com/ebaymotors/Parts-Accessories___PERFORMANCE-CHIP-MITSUBISHI-ECLIPSE-1990-2009-GAS-SAVER_W0QQitemZ250328321824QQddnZPartsQ20Q26Q20AccessoriesQQddiZ2811QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item250328321824&_trksid=p4506.c0.m245&_trkparms=72%3A543|65%3A12|39%3A1|240%3A1318