X1 million on the Progressive.
I'm here at a RV park in Mexico and my 50A fixed PI not only protected me from the repeated overvoltage, but after they fixed that, it protected me from a huge overload on an underrated CB, which caused the entire park to get a huge spike and sparks everywhere. Equipment in several RVs was ruined (but the RV park owner bought them new - kind of unusual), but mine was shut off by the PI as soon as it started so I only lost a SWiM PSU for the satellite. Probably from the repeated abuse over the preceding weeks. Had a spare.
The PI also has removable surge and spike devices so if you do get a huge spike, you just replace that board and you're good again. For free!