I'm not a Saiga fan. Here's why:
1. I don't like the 1mm receiver. There are thicker, better stamped receivers out there and milled ones that are better. No, I am not personally aware of a 1mm receiver gun failing, but they feel tinny and cheap to me.
2. I don't like the configuration that the Saigas come in - you have to spend more money to get them to look and feel like an AK.
When I was on the hunt for a newer AK, I did my research and ended up buying one professionally built on a NODAK 1.5mm receiver using a high quality numbers matching polish parts set - WITH CHROME LINED BARREL. The only thing I don't really like about the one I purchased was that it has a black coating on it (like duracoat), which is very durable. But, I'd prefer it to be blued. I looked at the Saigas, but when I actually held one I wasn't impressed.
FWIW, you can tell the difference between a 1mm receiver, a 1.5mm receiver and even a 1.6mm receiver just by looking at the gun. I'd really rather have a 1.6mm receiver, but the only one I found had a US non-chrome lined barrel, so I didn't go with that one.