Here is a review of the Turtle Was Ice product line... seems pretty much on the mark to me.
Mustangworld - Turtle wax ICE care care system
All in all I think the products work well, a little goes a long way, and are time saver.. I think what it comes down to, imo, is in what kind of shape is your vehicle to start with... if you have been on top of things or the car is already in good shape I think the Liquid Clay bar is fine. Easy to use, some elbow grease required, and faster than the traditional clay bar. If the car hasn't been done is some time or really needs a good "scrubbing" then the orginal clay bar is the better way to go.
Kinda the same thing with the Ice liquid wax/polish.. the stuff is easy to use and very forgiving (doesnt matter if it gets on the trim or not) but as Turtle Wax themselves say ... the Ice paste is more durable and protects better. Again if you stay on top of things then you could use the liquid just fine, if you drive a lot or have longer times between waxing then taking the extra time to use your favorite paste is the way to go.
For me I am contantly dusting and touching up the my car so the Ice liquid clay bar and wax are fine. I appreciate the ease of use and less time requirements.... and when followed up with my Meguires Quick Detail spray....the car looks great.