I've also got a 550, and it's been invaluable - worked everywhere I've been! I bought the European maps version, but there's loads of extras to download afterwards. Although maps / signs are fine for most of the journey, GPS is excellent in town / city centres. It's also very useful if you need fuel in a hurry! I've never used the points-of-interest function yet, but I can see that that could be useful, too.
It's a VERY easy device to use, even with gloves on, and mine's always works fine. I've coupled mine with a bluetooth headset (a pain you don't get one with it!), so voice prompts are easily followed.
The battery life on mine's only about 4-5 hours, but I've had it hardwired onto the bike's battery, and it's excellent.
Find one at a good price, and it's a great bit of kit.
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