I have been using the Antidote for nearly a year now. As far as the new opening being easier to use, it is a bit tricky the first few times of getting it closed. But it is easier to open. One of the reasons of the new design was that the old one was very easy to over tighten and very hard to open. they succeeded there. And the seam to flatten out the reservoir was way over due.
With the opening PROPERLY close, i have never experienced any leaks.