I have a different take on this.
I bought both reflectors with my DBS/3SD and it came with the SM installed.
Used it for a day or two like that and then put in the OP and have never even thought about using the SM again.
The Deree lights throw fine, but so little of what I (personally) use a light for is benefitted by just a bright center beam.
Throw is way over-rated for typical uses of flashlights while it's a nice spill that makes a light more useful in almost every instance.
Personally, I wish the OP from Deree would have been made to diffuse a little more than it does already.