Top 2 qualifiers yesterday in VTA on an asphalt parking lot race were TC3's including mine. I took the win and had the fastest lap of the main against TC5's using better batteries and speed controls. I'm just using a LRP Sphere TC with Checkpoint 4900 batteries.
As far as durability in VTA, about the only part I ever break is caster blocks. However, I don't break those very often. Even if I do break a caster block, the part will usually hold together long enough to finish a race. I think in 1 year of racing I may have broken 1 rear A-arm, and that was a fluke as I caught a barrier just right. Since the bodies in VTA are mostly 200mm+, they do a great job of protecting the car.
Some after market parts have become very hard to find for the TC3, such as RPM bumpers or aluminum hop-ups. However, the main parts are still easy to find locally, on TowerHobbies, or directly from Associated. I just ordered 2 graphite tub chassis from Team Associated website for $10 each.
While there may be newer or better cars available, the TC3 is still a competitive car for the VTA class.
I'm currently racing VTA. Check here for rules/info: http://www.usvintagetransam.com/