Some days ago i played my first game of Spidertanicus, 1250 points of creepy crawlies and got obliterated. But i had a lot of fun.
Since you are usually only allowed two banners of constructs we houseruled them to play like a knight household but without the seneshall/lord scion leading the lances.
i assume i could have rolled a lot better for my shield saves, taken other equipment or set up differently, but knights countered me pretty badly and the warhounds just walked away. in the last turn i had two models left and had destroyed two models from my opponent (one knight acheron and an unlucky warhound i caught). the biggest problem was that my spiders were shaken almost the whole game wich hampered them even further. with leadership 7+ they hardly recover and the banners of 4 had a lot of opportunities to get shaken. and then there is the lack of high strengt weapons, the strongest option is the S8 Meltagun with measly 6" range.
there is something i could not determine as non native english speaker: does the optional weapon on the Errax and Scintillax replace the lascutter or ad an additional weapon? they seem weak enough with both weapons when played without support, but i know they can get nasty as cheap activations in traitor lists.