Did the upgrade yesterday. We A/B'd the old vs new and find the modified Forte IV (nee III) to be much refined, less harsh and in some cases, better bass response. All in all, I'm delighted!
For those wanting photos - a Google photo album is available here: https://photos.app.goo.gl/pY25wK19DLvBPevE7
We really took our time with the first one - exploring the Forte III and taking pictures. It took us about an hour. The second one took ~ 20 minutes.
Components, instructions, shipping, etc. Were fantastic. I also took the opportunity to swap in the Lambswool grills, which I love with the cherry.
Thanks @Chief bonehead!
PS - I watched the video on the Belle's and it was great!