1990 when I saved up enough lawn mowing money to buy one along with Bonk's Adventure. It came with Keith Courage and I played the hell out of it, and I picked up Ninja Spirit and Legendary Axe soon after that. Bonk's Adventure and Pac-Land rounded up my library back then, though I played a bunch of other Turbo Chips and CDs at a friend's house, including Splatterhouse, Shadow of the Beast, Bomberman, Fighting Street and a bunch of others.
I was Turbo-less from late 1992 until 2006 when I picked up a PCE Duo, which promptly had the laser die after I tried a Dracula X CDR in it. I shipped it back to Japan for roughly $50 and got a replacement, which also worked with production games. After the limited warranty period was up I tried another Dracula X CDR and it died immediately. At which point I shipped my broken DUO (after extensive testing to see if I could repair it) to a fellow who traded it for parts for my region modded DUO/R. Total cost for getting back into Turbo/PCE/DUO gaming, $400 for hardware alone. Oh yeah.