I tried a few of those types of kits. Not that brand in particular, but others.
There are generally 2 types of devices out there. First is the type that converts HDMI signals using a direct cat 5 wire. These are not IP devices. General experience with these is that it's VERY picky about cable length, type of cable, external interference, etc. Once you get it working, they seem to work fairly well, but getting to that point can result in a lot of hair pulling to say the least. It's not uncommon to get a video signal that has weird looking artifacts pop up on the screen.
The IP version of the devices that I've used seem to be much easier to deploy. Of course, this will all depend on the actual quality of the hardware and its ability to convert the signal properly. Note that every one I've used has created noticeable latency in the signal. Your usage will determine if that matters or not.
The other thing to make sure of is that you have the devices on their OWN network, or at the very least, on their own VLAN. The network broadcast traffic is tremendous and will cause issues with other devices. Other devices trying to broadcast can interrupt the signal as well, which is also obviously undesirable.