I have a Salvo Rat and a Heiser. They are pretty much equal in light output and beam spread.
I did have the opportunity to subjectively compare the Rebreather World LED 5 watt and my Heiser recently. Unfortunately, it was a dry test as I wasn't able to borrow the light. However, the 5W RBW LED light put the Heiser to shame. I could barely tell the Heiser was on (~100 feet out). 5W LED was displaying about a 5 foot diameter spot of light that was several magnitudes (difference of night and day) brighter than my Heiser. Beam spread looked pretty good too as we shot the back wall of a steel building (~100 feet). As others have noted, the attachment point leaves a lot to be desired but there's nothing stopping someone from having a different delring cap made.
Is the RBW Store going to stock the Tilltec W30?

We will certainly have a look at the Tilltec W30 if you think it is that good.
Please drop me a PM with the details when you get a minute.