I currently have HA on a Pi3, zigbee2mqtt and a range of cheap smart switches, sonoff’s and the odd Shelly.
I’m moving house next week so have the opportunity to swap out some of the less reliable bits of kit and start again 
I want to install a few ‘high’ quality smart dimmer switches in the lounge, dining area and kitchen.
I came across the lightwave range which looks very promising. Does anyone have any experience with these or can recommend a different brand?
First - where are you located? Device availability varies GREATLY by Geography.
I’m in the UK
Lutron Caseta by a large margin in my opinion. Just re-did all my switches after trying to go with cheaper solutions.
Op is in the UK - no Caseta - or any other US 110 devices.
I was going to vote for Lutron also.
Looked up Lutron website and looks like they have a different name “RA2 Select” using the same “Clear Connect” protocol, which is the same underpinning wireless protocol for Caseta.
Lutron RA2 Select System Overview
Looks like Lutron considers RA2 its flagship platform…?
Also looks like RA2 would require some planning and professional install.
Is RA2 a thing in UK?
Otherwise, maybe Smart Light Switches | Philips Hue (philips-hue.com/en-gb).