Fast and water based I can sort of see, but there's no point to it avoiding radar. The range of 180 miles (assuming I read that correctly) also makes it pretty pointless for search and rescue. You would have to know where someone is, the weather must be good enough to land on water, and they can't be more than 60 miles away.
A NH90 helicopter is faster, at 190mph (300km/h) and have longer range at 500 miles (800km). It also doesn't have to land to rescue someone.
> but there's no point to it avoiding radar
As other commenters have pointed out, search and rescue doesn't mean you're not going to get shot at. I agree with everyone else though that it's obviously going to be used for more than SAR.