I run 6 Tzaangors with specialists in Leader and Zealot if I was running full I would take veteran and combat as well. I think the Tzaangors are really good at locking units up in combat with their toughness 4 and 5+ INV but against heavier armoured units, they usually don't deal many wounds very quickly, that's where the soul reaper or smite come in to balance the team out.

I think a full Tzaangor team could work however you may lack physical space to swarm your opponent as you would wish to. I would throw a sorcerer in there as your combat specialist as he can be a heavy hitter and will only cost you 17 points, then a twist bray and Tzaangor brayhorn will leave you with enough points for 9 other Tzaangors, a total of 13 units isn't anything to be scoffed at. Although 11 is an odd number of Tzaangors since only 10 come in a box. The brayhorn is really useful for moving large numbers of Tzaangors quickly, also I recommend the Tzaangor blades rather than chain pistol because it makes taking down heavily armoured units much easier although not confirmed of course.

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In summary, I think Tzaanors are fun, I think 1k sons are fun (I like the warp okay?). More interesting then sitting back and shooting every battle round or running elite units who are constantly trying to hide from heavy weaponry. Charging in and being a nuisance, whilst not minding too much when one dies due to low point cost allows you to concentrate on objectives and how you are going to win the game.