Hi What are peoples thoughts on external wastegates?

I was thinking Tial or Turbosmart as there's not many really to consider...

TiAL Sport.com
or
Product | Ultra Gate38 | Turbosmart International

But my attention has been turned to the new watercooled version
TiAL Sport.com
Has anyone used these, how are they for reliability Is the plumbing a nightmare?
Would you run a water feed to the actuator before or after the turbo or in parralel?
It can also be ran without a waterfeed, how does this compare for reliability?

Cheers,
Ewan