I did just use the new Zipseams this past weekend at a wedding and am quite pleased with the improvements. Here are some things that I'd like to point out: - The size is awesome. It's not noticeable at all, whereas the originals were more bearable. - As stated previously, I love the string idea. It held very well. And I have full confidence that they will not slide out like the previously design. - The install wasn't bad, but did require more effort than the original. I tried pulling the string to lock into the channel, but wasn't successful. I ended up using a card to get the fabric into the channel and the string into the channel. Even still, I think the frustration is well worth the added security. - I haven't tried washing my shirt with the Zipseam installed, but I feel that the assembly will stay in place.