A cheaper way to do that which I started but have not finished yet (and after starting to run more wire for it, the cabling aspect may be harder)
1. Use the Audio Authority component distribution panels ($20-$40 each on ebay) to duplicate component feeds
2. Use a component video switcher that has IR inputs to select which one is active (I was looking at avtoolbox I think it was and each was around $120-$150 new).
3. Feed an output from each of four (for example) AA distribution panels to four component video switches.
This gives us 4 component sources being duplicated, which feed out to four component video switchers.
Then use an IR distribution system (I had a multi-zone xantech setup) to control the switches. In theory you get zero loss (from the distributin amp) and multi-source component video distribution.
Now, cabling takes 5 coax per run, which is the hard part, plus IR distribution and anything else already going to the end point. After starting to go through this, I am questioning how worth it it is, and replacing the cabling with baluns might be worth it (or using the solution you referenced). I haven't installed the other tv's upstairs yet so this wound up going on hold for awhile so it only got used for one source so avoided the distribution amps and switcher.
That being said, the product you mentioned might be augmented by using the component video switcher concept with IR distribution to give you multiple sources, but with the clean solution that the component over cat5 solution gives you. It should work, as you are messing with the signal before it goes into the cat5 distribution.
Too tired right now, hopefully this is not too much babbling...