I initially thought it was a few isolated incidents, but as time goes on Scoobynet is just full of people who have been affected by the issue. Many folk avoid the Hawk and the price in the market shows it. I do prefer the look of the Hawk front but personally wouldn't take the risk unless the engine has already been forged or enough preventative measures taken.
In terms of how they feel to drive, the other lads may disagree with me here but I found from test drives the 2.5 (tried an RB320 and a non-PPP STI) more torquey, linear and pedestrian to drive, but the 2.0 (my own STI PPP) a lot more exciting - namely a sudden surge of power in a set rev range. They do feel different and would suggest you try both, 2.5 issues not withstanding.