Anyone Using the Schroth T-Bar Sub-Strap ?

[Pokey]

I'm looking for a replacement for my Schroth Formula with the sub-straps that thread through the lap belt and loop over the shoulder straps.  Has anyone tried the T-bar sub-straps made by Schroth, and, if so, any issue with passing through the Tillett hole for that purpose or otherwise?  Given the T-bar moves the straps away from center toward the thighs it seems like it might be a nice blend of comfort and convenience.