Not a question I can easily answer, they sold very well. Were a proxy figure used in all the games from GW, when people got short of cash, or genuinally liked the far better style. Definatally the most banned by GW used in house games. What I can tell you whatever rules you decide, these suits rock and roll. Our house rules were, and still are D20 system. I won't talk of these suits in rule terms, however, make them to suit your own. Instead I`d prefer to tell of them as real, as described in the forum and other posts. Valkir will fill a hole on your battle field and stay there as long as certain criteria are met. They will burn, blast, and hand to hand all that attack them untill that tide turns or are destroyed. They are strong ,think of Starship Trooper book bounce armor (without the bounce). They have Heavy Support, but go through Ammo like salt. They have hand to hand weapons plus guns (Two Handed) to give them support up close and personal. This is where the real realism comes in, think "Tank", they need the infantry and Panzerjagers close. If the enemy, particulary the feral Shadowkesh, get toe to toe, they are just meat in a can. Movement is slow, you pay for all that lovely metal and weapons, they can't run and barely human walk. This is also where you really need the mules, they didn`t come with all those nice ammo and supply boxes for nothing. Whatever vehicle you decide to use to drop off your Valkir, it then loiters or safe lands, if VTOL, and does resupply by mules as your force runs low. The end of the Valkir will always come if they are not protected on their flanks an endless tide of feral Shadowkesh washing them away.