If it's just a 2.5 dropped in with no other work done, She'd pull like a train upto 4500rpm and then the turbo would run out of airflow and she'd be flat! all the time in great danger of melting a piston or just running shite,
If done properly she'll pull hard all the way to 7K rpm, If she has a boost gauge, see what boost she's boosting at and at what revs
As the lads said above, check which ecu it has, and let us know before you pay any deposit,
There are no typical bad points to look out for, maybe ask to hear the engine start from ice cold and see how noisey she is and drip her for oil before you go anywhere and see if it's fresh enough!
Have fun!
Dan