I don't know the liquivision, but I have recently started diving with a mares icon HD from a scubapro Galileo and I am a little disappointed.
the mares has a beautiful colour screen, but as with any piece of equipment, nothing is perfect. Things which I don't like:
1. You have to recharge the battery after every 4 dives or so. You also have to remember to charge it before the trip since it looses the battery in storage.
2. You have to reset the time and date after the battery runs down.
3. Although the physical size is the same as my galileo, the screen is smaller due to wasted bell space
4. The colour backlit screen is great, but I cannnot read my pressure on the boat In sunlight.
5. Although you can hook up more transmitters to the icon, I am also used to checking my buddy's air pressure on the galileo. You cannot do this on the icon.
i have in fact gone back to the scubapro, but only because they have a conservatism system which allows one to still see the underlying "no conservatism" times and make a cousin based in it, so you can for examp,e set a high level of conservatism and as the dive progresses the Galileo will tell you that "level" stops are requird. When it tells you that "deco" stops are needed, the. You have to make obligatory stops. Until then it is up to you.