I purchased several rings because I was purchasing a Titanium device and wasn't confident with my measurement. I wore each of them 1-2 days and settled on the one that was comfortable while still secure. Feels good knowing that my device will fit well!
I ordered a large series of sample base rings to help me figure out my ring size and I feel it was absolutely and completely worth it, given the investment I will he making for my custom Orion. I found even .5mm made a difference and while it took a little bit I am now confident that I have the absolutely right size for my device.
Feel a lot more comfortable I'm getting the right size
Very helpful in verifying fit
These really help in deciding what size you should get, especially if you're between sizes.