Executioners are identical to normal Leman Russ except they have a Plasma Destroyer instead of a battlecannon which is 60cm MW4+ slow firing. I've not used them enough to really make my mind up properly but I reckon they're good though need to used carefully to get the best use out of them. The Russes can hunt either vehicles or infantry while the Griffons add a couple of blast templates in there for cheap and to keep the activation numbers up. They die easy but if the enemy target them they're not targeting my other stuff. I normally prefer add-on Hydras too mostly, but I wanted to keep a high activation count. Both the Destroyer Tank Hunters and the Salamanders can scout so 12 scouts - and 75cm AT 2+ Sniper can be really useful - against Zombocom's Dark Eldar one formation sat on overwatch for 3 turns pointing at a webway portal preventing the Raider formation coming out as their shots would have blown them out of the sky and killed most of their passengers. I generally like the idea of the enemy having zero use for any of their AP and AA shots
