I've been riding Schwalbe Pro 1 tubeless (switched from Vittoria Raubino Pro 3) since last fall (Florida riding season never ends), including one 50k road race. I wouldn't say it's life-changing, but I will definitely not go back. I can run the Pro 1s at significantly lower pressure (60f/80r) without any measurable increase in rolling resistance (based on accumulated power meter data) and get more comfort and better traction. The sealant has fixed one small puncture so far -- probably a small piece of glass -- that I didn't even know about until post-ride inspection.