Shorelines are very good basses. I would say better than Skylines. They are quite on par with US Laklands in terms of make, fit and finish (I've had 2 of each), and have the same pickups and preamps. But they are limited in features and are not sent to US to be set up. However, ESP takes very good care of them.
I've had two, a SL4-94 and SL55-94. Note their model indices differ from those of Skylines. My understanding is that the hardware is akin to that of Skylines, but the wood types are neither ones used in US nor in Skylines. Shorelines also come in alder.
note the Fuji logo and matte hardware:
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SL 55-94 classic (alder), top, and US 55-94 std., bottom:
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In the past, it was a very good thing to get one for it was like an intermediate step between Skyline and US at close to the price of a Skyline. After the yen -to -dollar ratio changed that much, getting a Shoreline may be too expensive
Lastly, note that ESP also makes Skyline Japan Laklands that differ from those that we are used to. They have other woods (like, the deluxe comes in ALDER with a maple top), other pickups and electronics, and other model names, see below:
http://www.espguitars.co.jp/lakland/skyline/index.html
My understanding is that these Skylines by ESP are something like Edwards or mid-grade LTDs: made in ESP facilities in China etc. and set up and tested in Japan
I would get another Shoreline any day, but would like to play a Skyline by ESP before getting one.