I have used the Total Seal rings in my car. My engine builder is a high end professional builder. My motor had 10k ( street race miles) on it when I blew the stock head gaskets and blew graphite though out the motor, so a refresh was needed. I was still able to get by with a hone, mainly to prep the .020 bore for ring seating. I really have no complaints about them, I figure, if they seal great, less blow by, less crankcase pressure, less leaks, especially at 25 lbs +. And I have seen very high vacuum on my engine.
I was told by my engine builder last week, that they talked to Total Seal earlier in the year at a trade convention, and they said they have acheived 11-13 hp on the dyno on turbo buick motors from using the gapless rings on the top ring vice the second ring. So they sent my rings back and got top rings.