the haltech interceptor is much like the xede (infact, its the same housing, i enquired about them possibly being the same and rebadged, however, their 'apparently not')
if you want more information, call them up..
In my opinion, interceptors are a patch job.. But until now, we had no real choice..
But i must say, why dont you check out the new range of 'EDITERS' that recently come out.
There is quite a few of them, and are pretty close being realised.
You will be able to control your ecu with far better accuracy than with a interceptor