Just to add in my 2 cents, my house is predominately Z-Wave (not Plus although I now have a handful of those) and I don’t really have any issues in my house (2500sqft 2 story), at one point I did have some signal issues but it was quickly solved once I installed another switch nearby.
I have some Aeon RGB bulbs which are Z-Wave Plus but they’re all on my outer perimeter so not much (if at all) benefit from the Plus aspect of things. That being said, I’ve added about 20 extra Z-Wave devices recently and never once done a Z-Wave repair.
I have one Aeon Z-Wave bulb that’s not so happy right now but I have a feeling it’s a signal issue still anyway, I have about another 20 or so more switches to install so I’m hoping that might help, but given @JDRoberts 's note about a maximum of four hops, I’m wondering if I should stagger some Z-Wave Plus devices around the house in a backbone fashion as mentioned.
Are there any cheap plug in Z-Wave Plus devices? Bonus points for supporting beaming! EDIT: Derp. Read JD’s link here for a nice list!