I recently tried a Helstorm Rocket Battery during a 1500 point match with friends. We divided each team into three players with their own armies, and we each made a 500 point list, instead of collectively making a 1500 point army with only 3 heroes total and 1 rare etc.
My team consisted of myself (Empire), and a friend with Wood Elves and another with Chaos. (I know this doesn't make much sense). The other team was Lizardmen, Orcs and Goblins, and Bretonians.
It was much more successful than I presumed it would be based on others' reports, killing about 7 or 8 Saurus Warriors at extreme ranges and a Skink Priest (LV2). Also, it claimed the lives of some Bretonian Knights.
However, I got a 2 result on the Misfire table, which thankfuly scattered 6 inches back from the Battery, which was in the deployment zone the whole game, therefore sending the missiles off of the board.
I only misfired the one time, and, but it did scatter onto my friend's Marauder unit, which killed 4.
All in all I had some great fun with it, but it was also a nervous ordeal. What do you think of this "unreliable monster"?