Welcome to Bladeforums!
I have used the Cold Steel and Himalayan Imports kukris extensively, but not the Extrema Ratio. I bought an ER Col. Moschin military knife for a friend and was pretty impressed with the fit and finish. Had a really nice carry system too. Unfortunately, they are quite expensive---even more so these days (I bought it when the Euro was about $1.25).
One thing that concerns me a bit about the ER kukri is their statement that it is just a machete with a forward cant to the blade. I know that some lightweight kukris may seem close to that but a real one (or a decent copy) is not. With the exception of my lightweight HI Kumar Cobra, which feels like a lighter fighting kukri design, the vast majority of my kukris have more substantial blades than any machete I own. Much thicker and harder steel.
Another reservation I have about the ER kukri is the handle. The grip on the Col. Moschin was pretty comfortable despite its somewhat unorthodox styling. However, the fact that it's a decent military knife handle doesn't make it a good kukri handle. I believe the kukri grips are flared at the rear for a good reason---retention of the tool/weapon. A kukri is much heavier than the average military knife and I'd want the kukri type handle on a kukri. If you buy the ER kukri, I'd recommend using it with a wrist lanyard (especially if you use it for long enough sessions that your hand muscles start to tire). I've done multi-hour trail clearing projects with an HI sirupati (sp?---it's one of their longer-bladed models) and after an hour or more I was really glad they made the flared rear grip the way they did.
DancesWithKnives