I got to say, I like it. Not that I'd replace my real FALs, you can't compare 7.62x39 to 7.62x51 for power and range, but it looks like a nice addition to the collection if it's reliable.
Really, the SKS action is not much different than the FAL. Both use a tilting bolt. Both headspace the same way. Both use a top mounted gas tube with a tappet. The SKS's gas system is just not adjustable like the FAL's though.
Marrying the FAL to the SKS looks like it gives the SKS a better trigger design, pistol grip, and better sights. Plus is that an adjustable gas system on there?
On top of that, it looks like you get AK mags which are probably the best rifle mags in the world.
Again, not improving the FAL, but definitely an improvement for the SKS (if it works reliably). If it was me though, I'd have put the bolt handle on the left side and it needs a custom FAL lower that fits better.