Malroy,
Need to be a little careful with this. It is obviously cheaper for a reason.
I've noticed two things:
1 - It uses the older cold-cathode backlit displays, instead of the new daylight viewable TFT, which are fantastic. So, it might be more difficult to see in bright sunlight, and it will use slightly more battery power.
2 - It looks like if only accepts the standard Navionics charts, and not the newer more detailed Navionics Gold charts.
But it is WAAS enabled, so it has an accurate GPS, like the more modern units.
For the price it still looks like a better buy than just getting a standard GPS with black and white Garmin unit like the 152 (cost about