I thought so, and it was very handy indeed.
i was worried for a while when the zombies got skreeches (sp?), cos they are so fast and powerful, but i found a good way to deal with them was to cop a death of a unit in a city, but have groups of SWAT teams stationed in buildings 5+ squares away to snipe the b@$t@rd as it moved away from the city.
and, although i was weary of monster zombies, they are not really that scary. they can only move on roads, giving you lots of areas to stack sniping units to blast them away, and they can never get close enough to attack buildings if you have enough sniping units.
some that annoyed me was the survivors were attacking the school at the same time i was, but while i was sniping with my SWATs and marines, and bombarding with my tanks, they were throwing spunky kids and guard dogs against alpha zombies, who then enslaved new alpha zombie when the kids died! i killed probably 8-10 more alpha zombies than i needed to.
oh, and another thing, troop trucks are AWESOME for hit and runs. load up a troop truck with SWATs, take them three squares out of a building, unload them, they all fire off one shot each, load them back in and return to the building. effectively this means you are able to bombard five squares in one direction