Yes. I've handled, but not shot, that rifle, or one very like it. They're pretty slick.
For more money, you can get them with G3 type drum sights, rail handguards, etc. Tromix has a ton of custom options.
What made me decide against one of these is that you can't mount an Aimpoint on it. MEANING, the .308 won't accept an Ultimak mount. However, that's only because I'm left handed. Most of the Russian siderail mounts are offset to the left, which would make them very awkard for me to use. For a righty, or if you want a Kobra sight, or if you just want the irons, it's a non-issue. You can get low-mounts that will set the optic virtually on top of the dust cover, or more traditional siderail mounts. Plus, there is an interesting variety of Russian optics out there that use the siderail mount.
I've seen the magazines they've designed, too. They're sturdier than the original factory mags, so they should hold up okay. They torture tested one by throwing it around the parking lot, stepping on it, etc.
Now, to be fair, yes, you're looking at magazines available from only one supplier. The same could be said for the DPMS .308, and as I've mentioned, their mags are even more expensive. Worse comes to worse, you can buy the regular 8-round Saiga mags and convert them to ten rounds by shortening the follower legs slightly.
On the upshot, though, AKs are built pretty tough. It's not often that one breaks, and the majority of parts of the converted Saiga .308 are the same as any other AK. (The bolt carrier group being an obvious exception.)
So, if I didn't have my FAL already, yeah, I'd be mighty tempted by these, especially for the low price. My FAL, in its original STG-58A configuration, ran me $950 back in 2001-02. The DSA STG-58s are harder to find now, as the supply of STG parts is drying up. I've heard rumors that they've discontinued them, but I don't know that for sure.
Another option might be an
Ohio Rapid Fire FAL. I've heard good things about these. They're cheaper 'cause they're made with surplus parts and, I think Imbel receivers, but I'm not positive on that.