The switches will say “LED compatible.”
Most zwave switches that require a neutral wire will be LED compatible.
The ones that aren’t are mostly the older ones that don’t require a neutral.
http://www.homeseer.com/compare-z-wave-dimming-wall-switches.html
The reason there are so many forum topics is that many light boxes don’t have a neutral, and people are usually hoping to avoid the expense and trouble of fishing up a neutral by using one of the older switches, but then they run into the bulb compatibility issue.
As far as the neutral wire…if your house was built in Canada in the last 30 years, there will probably be a neutral somewhere, either in the wall or at the fixture. So it’s usually just a matter of “fishing up” the neutral and bringing it to the wall switch. The electrician will know.