Lets see.........
I had to drive out of town and out of my state in order to purchase my Turbo Grafx 16 from a Toy-R-Us. Had to do the same thing whenever I wanted as new game. This was back when there was really no internet. There was only mail order from the back of game magazines. And the SNES hadn't hit the store shelves yet. Arcades was where everyone met.
I'm the only one that had one around me and I was the only one who knew what a TG16 was.
It has already been said, the poor support that NEC gave the system in the US. So many games that should have been released here. Which leads me to say that, it should never had region lock on the system.
Hated myself for not picking up the rare Turbo booster back then. Why wasn't that in the system in the first place?
I agree with the turbo tap as mentioned. It was a bit irritating to get one so that others could play.
Other than those few things, I fell in love with the TG16 as soon as I got home and pulled it out of the box. And I am still on a honeymoon with it. I treat mine with kid gloves and seemly treasure the TG16 above all of my other consoles.