I have one
My RV10 has a Weldon pump A8163-A installed in the tunnel. This RV10 is 12 years old and has 950 hours on it. This last summer while on an extended summer trip as far from home as possible, Orcas Island in San Juan Islands, this pump failed and popped the circuit breaker. So I got to replace it on the ramp while out of town. Fortunately, Aircraft Spruce had them in stock for $1200 plus a $400 core charge so clearly they wanted the old pump back. If I would have been home, I would have reworked the tubing to replace it with an experimental pump. So that is my experience with a Weldon pump.