The rio Hondo I had, I bought pretty recently (few months ago) at a very small size, only about an inch, and he died within a month for seemingly no reason. The other fish were fine, and I didn't notice anything strange about him, so no real idea why he passed. He was a very active little fish, ate well. Heres the only pic I took of him
My escondido, I grew from a similar size, to about 8". I ended up re-homing him and all my other fish because I went away to school and had to get rid of the tank. While I had him he was cool, held his own but didn't go out of his way to start problems in the tank. Their behavior reminds me of an amphilophus, but a more chilled-out version. I have heard stories of some people's being every bit as aggressive as a Midas, but that was not my experience with them.
Here's a pic of the carpintis, looks like he was around 6-7" at the time (this was years back)