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hugo7-
Well the thing is, they don't really know! modern plastic pipes have only been used in plumbing for around 20 years or so, so the total lifespan is unknown, apparently it is the rubber seals in the plastic piping that is likely to go rather than the pipe itself. I guess given most people change their bathroom every 20 years or less then it probably won't be an issue for most, as can just change the pipes at that point.
We have a mixture of copper and plastic in house, simply because I couldn't afford to do all copper, given the amount of pipes we have!
Sam_w
It's much-debated to be fair but the consensus is that the plastic fittings are more likely to fail over time, whereas copper is doing it properly and a job for life, which is what you want when the pipes are buried in your walls.
Sorry @Vince that was probably a bit strong. I'm sure you'll be fine.