Absolutely love the tama-go, mostly BECAUSE of it's size, I love it's bulkiness, it feels sturdy to me
Also it got good features, a nice growth process, and good gotchi characters, potty training might be hard, but that's just because a perfect care level gotchi shouldn't be EASY to get. Everyone complains about this particular thing, but I really like that it's decently hard to get a perfect care gotchi, since it's a challenge. People who complain it's to hard are just to "lazy" to try get it the hard way, but I don't mean that that's a bad thing, I just think it's correct to have challenges.
Also I've had an entama in the past, with several connection version, but this tama-go seems to have bits and pieces of several version of tamagotchis, making it a well rounded device, which only leaves room for improvement in a later stage of production of new devices, by adding more features to it. But that simply isn't really a problem for the tama-go, since it's well rounded, which makes it perfect for me just now.
I've had a p1, p2, several connections, music stars, entamas, an angel, and several other types, and love them all, each has it's own quality, and the tama-go tries to take bits and pieces of what I like about those features, and it has accomplished that for me atleast
Now we can talk day and night about how bad or good the tama-go is, but what's important is, if you like it, you like it, if you don't, you don't, but we all love tamagotchi in general, and just keep playing