Well, I used C&A "gapless" 2nd rings two builds ago (similar to the original Total Seal "gapless 2nd), and Total Seal "gapless" top rings w/ traditional 2nd ring and standard-tension oil rings on the build after that. I can't quantify any benefits from either approach, to be blunt.

With my latest (re)build, I returned to conventional top rings and Napier 2nd rings gapped at .020" & .024" respectively. I also went with slightly lighter-tension oil rings (18# vs 21#), but will be keeping an eye on potential oil consumption issues.

"In theory", I like the "gapless" top ring... but you really pay a premium for them. I'd have to see more independent testing from sources I can put 100% faith in before I'd consider trying them again. Since I haven't, my backup short-block parts collection already includes the same ring pack as what I just put into my latest build.