If you were in the market for these parts as maintenance replacements, which of the myriad offerings should be installed?
On my RX300, only genuine Denso brand sensors and actuator/solenoids were ever installed.
Since the car is hovering into 140,000 miles, I can only suspect that parts like these. which tend to get heat-stressed, could stand to have fresh components cycled in as a prophylactic measure.

 

I have over 200,000 miles on my 2011, no issues with the camshaft actuators , the solenoids will set a code , if that happens, I recommend GM genuine

 

If replacement is needed, I would spring for AC Delco. Have used others in a pinch and worked fine.

That said, I can't see replacing those solenoid valves if they are functioning properly. These parts might last the life of the car. The solenoid coils are a common failure point, but they do not have a predictable life. The valve section doesn't tend to wear out so much as it tends to fail from clogging or sticking due to neglected oil changes and/or low-grade oil.

Are you experiencing problems?