They can't go online right now, Once they are online they will need a new KV about every 48 hours which could cost between $20-$80 for an unshared one, You can delete system files easley so don't screw around with the system files, Thats some things you should know about jtags in general

Xenon have bad failure rate but are the cheapest, Zephyr is the same thing but has hdmi, falcon is probably one of the most known ones, low fail rate and runs good, Jaspers are the best but the most expensive, Very prone to getting RROD and run the best out of all. You can get a slim rgh which are pretty good, but i preferably like jaspers better than anything, i have one my self and runs great. So Good luck.