I have used Turtle Wax Ice Liquid Clay Bar several times and it's an okay product.
I don't find it to be any faster or easiser than using a regular clay bar. The vehicle has to be wet when using Liquid Clay Bar (so start applying either right after you wash, or using a spray bottle of water to prep the surface). Since it is part polish, it will completely strip off any existing wax protection...even the durable ones like Zaino, Duragloss, Collinite, etc. for a well-prepped surface.
The surface comes out pretty smooth but I did perform a side-by-side comparison on my hood and noticed that traditional clay makes the surface feel noticeably smoother. There is also some contamination that traditional clay will remove which Liquid Clay cannot remove. Ice Liquid Clay Bar is more of a paste-polish type product and is applied by hand with a regular applicator....contamination sticks to clay much better and you know you picked up everything with clay once the area you are working on is completely smooth.
I have noticed that the Ice Polish seems to bond and work best (in terms of shine and durability) when paired up with the Ice Liquid Clay Bar. You can easily follow up any product with Ice Liquid Clay Bar, but as I said before, I definitely get better results with traditional clay. It's only worth the Liquid Clay Bar if you really dig the Ice Polish and want the absolute best performance out of the Ice Polish, but then you have to use the Ice Quick Detailer and the Ice Car Wash to properly maintain the current "Ice" protection you have applied.
Sorry if this is long and I got ADD on you, I just thought you may want to know the details before making your decision. Obviously, my opinion is to skip the Liquid Clay as it's the same amount of effort vs traditional clay and I like the results better than Ice Clay Bar, but maybe surf the web a bit and see what other people have to say.