ms in my opinion is a better ems then nemisis. granded nemisis and aem are going to be the easier ems to install/tune i think ms is worth it. their is always upgrades for it and you can add stuff to it whenever you want. like if you want to add a electronic boost controller you just have to buy the chip for it and sodder it on and bam! i dont know much about it right now. i havent had the time to mess with it lately and dont have the unit yet either. going to wait till i have the motor assembled.