Just offering another opinion, a few years back I looked at using this system and after seeing the price of the components it was a hard pill to swallow. Turned out that I actually couldn't use the system because the control panel in question was not deep enough to accommodate the staking of the logix rack onto the conversion plate, the logix power supply hanging off to the left also had clearance issues so I needed to figure out an alternate solution.
I was able to use PointIO. Within the same footprint of the PLC5 rack I was able to build a PointIO rack with all of the IO the previous PLC5 had, and had room above the PointIO rack for the power supply, fusing and power terminals. Installation labor was not all that much more since the wiring just needed to be disconnected from the old, re-labeled and re-terminated to the PointIO. Wiring was plenty long enough as I had the PointIO rack mounted at the bottom of the previous PLC5 rack.
Results will vary depending on the PLC5 IO density, IIRC the PointIO material cost was 1/2 to 1/3 the cost of the conversion system. Even with the additional labor to wire up the PointIO rack it was still cheaper than the conversion system. The electricians had it all complete in about 1/2 day.
Looks like I will have a number of PLC5 obsolescence projects on my hands over the next few years, a quick audit of some of the panels shows I'll have clearance issues w/the conversion system. Looks like PointIO will become my go to.