I dunno, my bit critter (from like 1997 lol) doesnt take a lot of upkeep and is kinda boring as compared to a Tama..Thats why I purchased a Connections this week lol
Talking Nanos were pretty interesting and unique as far as v-pets go, but I wasn't a big fan of the original nanos. It also bothers me that the "new" nanos released recently are almost exactly the same as the old ones
You can get them off of e-bay, that is where I got all three of mine: the baby, the puppy, and the kitty. There are some on sale there that are still in the sealed packages.
I'm so-so on it. I mean I don't have one but my friend has one and she really likes hers but when she borrowed a tamagotchi she said the tama was a lot better, I would think the tamagotchi would have more stuff and it seems like it too because I ALWAYS see them in the store when I'm looking for tamagotchis!!!