Thanks Dann. Out of all those, I do have the Splice and Unknown. I will have to try those out since I have black Iridium and grey for the Unknown and Ice, green and purple lenses for the Splice. Out of my collection of 20+ pairs, the Unknown and Splice are 2 of my favorite looking frames.
I also have 2 pairs of original Half Jackets but no Romeo.

I know that the lenses for the Fives Squared and Fives 3.0 are compatible between the models. Are there any other frames that use the same lenses as another frame?