The Playtex insulator cups are our favorite sippy cups by far, and we have tried many different cups. The no spill valves work well and store inside the lid. The insulating feature does not keep stuff cold for a long time but it is still WELL worth the extra money because it pretty much eliminates condensation which we all know is a real pain in the diaper bag, on furniture, etc. Some no spill cups require so much sucking power to actually get anything out of them that your kid looks like he's going to burst a blood vessel trying to drink his apple juice. Happily, that is not the case with these....