The main difference I can see between the Tilty and our other go-to sippy, the Take-N-Toss, is the way the cup is angled to make it easier for babies to drink without tilting their heads back too much. Other than that, both cups are valve-less, which is good because children don't have to suck so hard to drink. The drawback is that cups without valves are DRIPPY. But that doesn't really matter if children are just drinking at mealtimes or snacktimes, when they are at the table anyway.
Sydney likes drinking out of her new cups. Since she is already used to drinking out of a regular (lidless) cup, it hasn't made a huge difference for her, but I can see how it would help a younger baby. A young baby would get a much more realistic drinking experience and would probably have an easier time transitioning to a regular cup after using the Tilty.
There was one minor problem I had with the Tilty--it is dishwasher safe (top rack) and due to the open bottom design, water pooled in the bottom of the cup extensively. Not a big deal, but it might be better to close off the bottom in future designs of the Tilty.
Tilty cups are available at select retailers or online at the Tilty website for about $6 for a two-pack. If you would like to win your own pack of two Tilty cups, please leave a comment. US addresses only, please. Contest ends Sunday, April 26.