I've seen all 4 seasons and I have to say, this is one of my favorite shows of all-time. I don't speak Spanish so I watched the entire thing with subtitles and boy was it worth it!
The acting is fantastic, In fact, they're all so good that it's hard to decide on a favorite character (Chava?, Isabel?, Hugo Sanchez?!?). The cast is so good, it sometimes reminds me of Seinfeld where each personality was completely different, but the one thing they all had in common was their lack of empathy.
This might be the first show I've watched where I didn't find a single boring scene in any of the 4 seasons. It's funny, zany, dramatic and sometimes emotional.
I highly recommend this, even if you don't speak Spanish! Watch it!