The 150in1 is one of the better, but there is an even nicer one, and in Famicom format can cost you like 1/2 the price of that. The Super Games 500in1. It has maybe 330~ unique games with NO repeats, and the other are subpar lesser than homebrew quality pure garbage from who knows where.
The 500in1 has a lot of those $50-1000 Famicom/NES era stuff people go stupid over with their wallets now so the selection is a fantastic slice of goodies. It does lack some of those games people go nuts over, but they tend to be chipped games by the maker. Things like the Konami VRC line of stuff (Twinbee 3, Gradius 2, Yume Monogatari Penguin, Castlevania III, Crisis Force, Bio Miracle Bokuette Upa, and others aren't on it.) But you do get the nasties like Adventure Island 4, Little Samson, Bubble Bobble 2, Contra Force, TMNT Tournament Fighters, Rescue Rangers 2, Gun Nac, Flintstones 2, and others. I'd go find a list and skim it as it's crazy.