So far, I have yet to see Defiler's summon pet in the first big city after playing 2 hours each night for the past 3 nights. All I see is scorpian.
Now, I think this has something to do with the fact that Savant is the default choice when player clicks "Summoner" on the first screen and that changing Class/Race is somewhat confusing. I think if the player already chose Summoner, the Defiler should appear as the second choice but instead you have to scroll through Race/Class to find Defiler.
My problem with not picking Defiler is that I plan to go with Zombie (Fiend) build. My Savant is only lvl 6 and I haven't even got Zombie yet. Defiler's special ability is to buff the pet's Strength and Dex for 30s. Does this apply to Zombie's Acid attacks? I would assume those are "spells" but like I've said, I haven't tried Zombie yet. If Zombie's attacks are considered "spell", then I think Defiler's Care should buff pet's INT as well for 30s because it is only fair that Racial benefit should benefit all the pets and not just the main Tank pet.
If Defiler's Care does increase Zombie's damage, maybe the description can be in more details?