After reading Cook's Illustrated's recommendation of this press, I was all set to love this press and tried several times to change my mind, but I just didn't. Instead, I bought a Calphalon garlic press that I think is a much better one.
Pros of Zyliss:
(1)It does press most of the garlic out. Slightly more if the cloves are prepeeled.
(2)It can press a few cloves at once.
(3)It comes with an attached cleaner, which is hard to lose.
Cons:
(1) It is hard to squeeze multiple cloves, especially if the cloves are unpeeled.
(2) If you want to press multiple batches, you have to clean out the peels from the previous batch before proceeding.
(3) You do need to use the cleaner (or a bamboo skewer or other pointy device) to get the smashed peels out of the hopper.
(4)If the cloves are unpeeled, the garlic left behind is particularly tough to clean out because the holes are slighly recessed on the inside of the hopper. It is difficult to get anything in there that is effective at scrubbing the garlic out.
The Calphalon garlic press has built in spikes on the plunger. It pokes through the garlic skins and makes it easier to press the garlic. The skins stick to the spikes so when you open it back up, you just peel off the skins and move on to the next batch (or leave them, add more garlic to the hopper and keep pressing.) It doesn't allow garlic to squeeze up past the plunger. However, IF you decide to peel the garlic first, it does leave more behind than the Zyliss and it is then harder to clean the remaining garlic off the spikes. (Unpeeled, both the Calphalon and Zyliss leave a similar amount behind.) Not being willing to do any more work than is required, I simply solve that problem by not peeling first. A toothbrush works great to clean off anything stuck in the spikes. The only other down side to the Calphalon is that the hopper is a bit smaller (normal size as opposed to Zyliss' oversized hopper), so you may need to do multiple batches if you are pressing a lot of garlic. But it is easy and in the end, less time consuming to use and clean than the Zyliss.