You can look for yourself. See "Sample Articles" on the left:
http://www.practical-sailor.com

This is a snip from a sample article from the site:

"Raymarine L470
This is the most expensive unit tested. It's about average size, but has one
of the larger screens. Too bad the resolution at 240 x 128 is well below the
best units. The L470 came equipped with an Airmar P65 transducer, which
includes speed and temperature sensing. It is a dual-frequency unit with 500
RMS watts of power and an abundance of features.

Like the best units tested, the backlighting evenly illuminates the complete
screen and has six levels of adjustment-but even at its brightest it failed
to equal the Garmin and Furuno.

Two quirky things about the machine: First, the mounting bracket is not
secure enough and picks up any boat vibration that may be present. Granted,
this would be a non-issue if you flush-mount the display. Second, the cable
connections are the push-in types that use an O-ring lock. We'd rather see a
positive mechanical lock, as featured on most of the other units. On the
plus side, the warranty is the best of the six tested products.

We asked Raymarine to review our comments. Product Manager Morton Andreason
responded, "Although I don't disagree with most of your conclusions, the
product is obviously getting a little dated. I do feel the review focused
too much on the negative aspect of the product, and ignores many of the
unique strengths of the L470." (He mentioned the 500W RMS of power at both
frequencies and PVDF Sidelooker transducer option, which he said "offers the
best Sidelooker option in the industry."

Bottom Line: At this price, we'd expect better attention to details like the
bracket, and better screen resolution. This unit only has about half the
total pixels of the Garmin and about 40% of the Furuno."

--
Ken Heaton & Anne Tobin
Cape Breton Island, Canada
kenheaton AT ess wye dee DOT eastlink DOT ca