Its ur choice what u want. If u want almost the whole inventory with unreleased weapons then u should buy the inventory hack. If u want a multihack with rapid fire, fly hack etc. then u should buy the uber hack.
It will be signed as a virus a guess but u can turn off ur anti virus programm and u can start hacking!

It only works on Softnyx Wolfteam. On Aeriagames Wolfteam itīs patched.