Frankly I like it, and the price is down right cheap.

I don't use it like a full on chart plotter, so I have not really run into the "slowness issues" you speak of. I use it to plan and create routes and to manage waypoints and play back tracks.

En route, I still use paper charts, handheld GPS, and the old eyeballs. But then again, I am not navigating some narrow tricky passages that some cruisers encounter.

I do quite a bit of racing, and for various mark (island, rock... etc) roundings, danger bearings and the like, that I can program into my GPS, Ozi works great.

Plus the feature of being able to geo-reference any .bmp or .tiff image has given me the ability to record hikes, and even drives and sync those up with Google satellite pictures. (just capture the sat image and convert it to the right format, and geo-reference it to known marks (road crossings and the like that I have "marked" with the GPS)

I have a feeling that Ozi gives me more freedoms that a full on nav tool might not offer.