For the price, I think Turtle Wax Ice is a good product. At least in the paste. I haven't ever used the liquid, so I can't give any opinion on it.
From my experience Turtle Wax Ice provides a nice shine and very good beading. Quest makes a comparison to Nu-finish, but not much of anything lasts as long as Nu-finish as far as water beading. But the tradeoff with Nu-finish, is it doesn't give a real deep shine. Nu-finish is 100% synthetic. And to date no one has figured out how to beat the shine of Carnauba. Nu-finish is a good example of that.
Ice will last as long as any other wax in it's price range, and that typically runs about 6 - 8 weeks. And I tend to wash my car about every 10 - 15 days.
The one down side to Ice is it doesn't bring out the metallic flake in dark colors. I've read a few reviews where others suggest that Ice is better suited for light colored cars, and I've also found that to be true.
As far as ease of application, Ice does come off a little easier than some other paste waxes I've used. But it's still a paste. Liquids come off easier, but then they tend to not last as long as a paste wax job.
If you want a wax that really dazzles with dark metallic paints, you may try Meguiars NXT 2.0. It really brings out the sparkle on my black Outback. But it doesn't bead quite as well as Ice. However, that may be because I decided to try the NXT in liquid.