My old man used to work for a company that bought one of
these systems. He set up the software for them, but never actually used the system, so can't vouch for the ease of use etc, but he said the set up was easy enough.
One (cheaper) alternative is
FlyOnTheWall who do wireless remote systems. You can link these to your PC with a suitable graphics card and image capturing software. The wife's grandfather has two cameras on his garages, but they are linked to a video rather than PC.
A second (even cheaper still) alternative is to paint yourself white, stand in the corner and make like a fridge!!
Have fun (whatever you do) and here's hoping you catch the b45t4rd.
WP