I have a remote unit. While not the Progressive, I have the Surge Guard unit.
I do have a voltage and frequency meter in the camper so I can monitor voltage in the camper. Yes, it is an extra unit, however it works with the genny and without it.
There has been one topic not mentioned yet, in the event of a very high power surge, (lightening hit) these units do their job of protecting the camper. I have read/heard (not seen with my own eyes) the unit dies in the process of dissipating the heavy power while protecting the camper. This rapid heat build up in some cases can result in a fire of the unit burning at the power post.
While this event may not happen often pending where you live, that would be one advantage to remote units over the hard wired units.
Good luck with your decision. Pro's and cons to both. Both are better then not having one.
John