my experience with TR20 is bad. that chiller malfunction and wipe out my entire reef tank. that was many years back. not too sure about now. now I only trust Arctica chiller.
imagine your coral and fishes could easily worth thousands +++ in the tank but bec we want to save cost in chiller, we take the risk of less reliability chiller. do the maths and you will rather pay more for a good chiller than having bad experience later on.