I have a TG16 and 4-5 games. It's definitely interesting and a fun curiosity that gets ignored by the nostalgia gaming mass. The games I have played all feel a little "different" somehow, it is hard to explain. Different vibe, different colors, art, I can't put my finger on it, but it didn't feel like a SNES/Genesis competitor, but just some weird little novelty doing its own thing. I know this doesn't make much sense, but maybe some of you guys can agree.
I've enjoyed everything I've played on it, but nothing was earth shattering either, all just enjoyable and that is not a bad thing. It's like the comfort food of gaming. I think if you enjoy the Neo-Geo you will like the TG16. I'd emulate it first just to see if the games appeal to you, and then make a decision to take the financial plunge.
I have Bonk, Keith Courage, some racing game, Alien Crush, and China Warrior. I know China Warrior gets a bad rep because it's kind of fucking awful, but I adore that game. Something so simple and idiotic just brings a smile to my face, and there is nothing like kicking through legions of power walking monks.
The tg-16/PCE are a great example of what was so great and at the same time terrible about late 80s early 90s gaming. The market was booming and it was the wild west out there. There was some truly crazy and adventurous stuff happening. Some of it was genius, and some of it was just god awful. The norm hadn't been figured out just yet so everyone was throwing stuff and the wall seeing what stuck.
Even though those gaming oddities don't always have the best games they are charming in their own way. It is partly why I like the neo so much. It is hella quirky and goes against all the conventional rules of what makes a successful gaming console. The TG16 is a bit like that.