From a practical standpoint, the TurboBooster (non-Plus version) is a completely worthless piece of hardware.
This thing was almost obsolete from day one because of the TurboBooster Plus, and was rendered totally so as soon as the relevant pins to tap off the expansion port for composite video and stereo sound became known back in the mid 90s. I remember finding the info on the TurboList circa 1996 and fabricating some of my own "custom" cables that did everything the standard Booster does, short of doubling the size of my console.
I can say all this without any guilt, since the listing has ended, but the only value something like this could possible have would be to some insane RoyVegas-type collector that thinks anything "TurboGrafx" branded means "big money."
Even if someone could somehow argue that they were unable to figure out how to tap off the expansion port and create their own composite cable, that they couldn't find someone on these forums to do it for them for cheap (or free), and that they absolutely had to have composite from their TG-16 but never wanted a CD-ROM, there'd still be no argument for buying one of these over a TurboBooster Plus.