You'll still need to make a contract, and they'll expect a share of any missions they help on (probably 1 point of profit factor, unless they're doing all the heavy lifting, in which case they'll ask for more)  Also remember that the Kroot will tend to turn on you if they can make more money somehow.  (however, it has to be enough to make up for not getting your business in the future)<br/><br/>But otherwise, no, you don't need to make the acquisition check in exchange for valuable xenotech like that.<br/><br/>As for the cloaking device, a forbidden lore (xeno) test will reveal information on how it will function when installed aboard a ship.