A couple of my friends have used the Redshift clip on aero bars and shifting seat post. They like it alot. It’s changes your road bike into a TT bike on the fly. The quick release attachments make the clip on aero bars easy and stable. The seat post flips from road to TT position on the fly. The system comes highly recommended by a world class bike fitter too. I’m planning on ordering my set very soon from Amazon, link here.
Pictures are from Redshift and DC Rainmaker.