Summary: This thing got me lost so many times, I was much better off without it. It often chose ridiculously out-of-the-way routes, and also tended to send me on wild goose chases for restaurants that didn't exist. The maps are frequently incomplete and/or incorrect, and since it can't be updated it won't be long before it's totally useless. There's something to be said for name brands.
Summary: I bought the H/K 300 for its price and its big screen. It's easy to read w/o putting on my reading glasses while driving. Sound quality is fine for my old ears. But....and this is a big one for me: it won't hold a charge for more than a day! And that's w/o turning it on at all. Moreover, I can't update maps, and there is a lot of building going on in my area. Would I buy one of these again. NO!
Summary: I have returned 2 now...the first one just quite working and the second one couldn't receive a signal. The first one was not an out of the box failure, but the second was. The maps are at least 2 years out of date. You will definately double, triple or even quadruple your U-Turns with this device.
Summary: I was generally pleased with this GPS system--my first--when it worked. I liked the big screen and it was pretty user-friendly. Occasionally it would lose signal in a weird spot, but it wasn't a big problem. About 2 weeks after we bought the thing it died--would not turn on at all. So we took it back and they gave us another one. It worked fine for about 3 months, then when I tried to turn it on today it was dead as a doornail once again.
Summary: The nice things about this unit are obvious: * the form factor * great screen * video support The bad points make me want to send it back: * The maps aren't very complete and they CANNOT be updated. Harmon Kardon's support is nonexistent and they certainly are far from providing map updates. In several cities in Northern California I've looked for restaurants and cafes and found almost nothing, when just driving down main street tells me there's tons.
Summary: The unit does a good job of giving directions. Although the software is rather in-flexible. It always picks the shortest route, not necessarily the easiest route. The unit has locked up on me a number of times, requiring it to be reset. I suspect it has something to do with heat. As it has happened after returning to the car after it has set outside for an hour or so. Tech support was prompt in their response, but no help.