I have found the imperial Bastion to be a fantastic addition to my Imperial Guard defense line. The height of the model allows excellent positions for artillery spotters, and it is strong enough to hide inside when Ordnance and Melta-weapons get too close. Also, the addition of a Anti-Aircraft Lascannon is a great way to stop any Helldrakes burning your ground troops to ashes, or a Comms relay allowing you to bring those much needed Valkyries on to the table sooner. combined too with the ‘Strong hold assault’ rules, up to 3 bastions with upto 5 Aegis defence lines can be taken as a single Fortifications option. Voila, half the table is fortified and owned by you! not to mention with all the AA guns, you will have your opponent dreading taking flyers