I've used a similar hose in the US and really liked it--great for vegetable gardening. I just turn it on for an hour or two, and it deliver the water directly to the plants' roots. It seems to save water and is easy to install.
I'm using four of them with mains pressure on my raised beds – not from Hunkin. They're excellent. Mitre 10 have them, some by Netta I think and a cheaper brand.
1. Less water waste. The water goes exactly where you want it.
2. You're not spraying water all over the plants, which can cause problems if it's sunny or encourage mildew if you do it in the evening.