Hi mate
As an owner of a SportCross for the last 3 years I can honestly say its a great car!
Reliable, well built, fairly rare compared to the saloons. Never had anything go wrong with either of my IS's.
As for boot space, we go to the in-laws regularly (wife and 2 kids) and we take a large suitcase, 2 large coolbags, 2 sportsbags, numerous carriers and a buggy. Dropping the boot floor down gains a few inches as mentioned previously.
Also, the rear seats fold down for the larger load. And additionally, the front passenger seat folds forward too!
I've actually had 12 foot wardrobe panels in mine!
Drives and feels just like a regular IS (I had one for 2 years prior to the SportCross) but you have a hatchback boot!
Don't know what year you're looking for, but I've just decided to sell mine. See here: Click Me
If you want any more info, drop me a PM
atb
Matt