I use a set of those headphones myself and had them about 2 years,they work on all my detectors thus far very well,no delay and very easy to install,but they do have one down fall and that is the battery life,for the most part they get about 6 hours and possibly a little longer,but if you are out on a all day hunt you are taking the battery life to the limit.Cannot fault them really apart from the over sight of the battery life.
Garrett Z-Lynk basically are exactly the same and operate on the same freq etc but the biggest trump card that Garrett have is the fact that the battery life lasts a incredible 30 hours over the 6 hours on the headphones that you are suggested,a no brainer really in my mind.Basic sizes are the same but just a better thought out battery setup.
I have used the Garrett setup and will be ordering a set this weekend,just because of the longer battery life,during the summer i can spend 10-12 hours a day out detecting,so the Garrett ones will still be working and still have plenty of life left in the batteries for say a complete weekend detecting session.
Just my personal opinion of course,both sets of wireless headphone do exactly the same thing with the exception of 6hours on one and upto 30 hours on the other set,you decide for yourself