More trouble than they are worth in my opinion. Gotta reach way down in there to get to the fish. Id go with a cooler setup. Cheaper and more convenient IMO. Coolers are Easier to take in and out, and most come with cupholders 8) that are more useful that the tray/hatch thing on the Toho Rig. I fished tournaments in a 9.9hp lake growing up, and all the guys that invested in a toho rig ended up going back to the cooler setup.
The big thing with a cooler setup is there is no wasted space....No need to have a rig that stretches out the whole width of the boat IMO