Thoughts so far

1. Definitely needs improvement. Smaller units, or units that have a lot of upper bulk (Ultralisk?) it's not near as noticeable. Movements themselves are fluid, but even rocking a 45* angle is jarring. Not a game-breaker, but annoying sometimes.

2. Don't have exacts, but it's a tad pricey, I think over 200m and 100g. It's strongish in terms of both attack and defense, but it's definitely not a Dragoon in terms of overall usage. It plays as more of a reactionary unit... You wouldn't build one unless you know the enemy has some real heavy hitters (namely siege tanks, but it performs well against other high damage units; note to self: test Snipe on one). I believe they have a damage bonus against armored units (either immortals or stalkers, immortal makes more sense). At first, I was frustrated that it's lacking GtA ability, but there's sooo many other units that destroy air, it's not an issue. The biggest weakness they have is that they are easily defeated by light but speedy attacks. Zerglings with the speed upgrade absolutely shred them, and carriers do much the same.

 

I can't see how the Infestor is a repalcement for the Lurker. The Lurker wasn't a caster, the Defiler was. The Lurker was the only cloaked Zerg unit and capable of setting traps at the choke or in your base in case someone recalls you.