Hi,
I have a huge collection of OG Sudan Range. I bought them when others were not available.
I like them. Unfortunatley for OG there are better miniatures available now. But I think if you need large numbers they are still a bargain.
It was quite a lot of work to clean them.
You can mix them with Perry Ansar. Thats no problem. On the distance there is not much of a difference. While game mastering a Sudan adventure with my figures they were mistaken as Perry miniatures so guess they are ok

Here are pictures from my mate Dominic from a Sword and the Flame game we did a few years back.
The flag bearer and swordsmen are all OG.

The beja are OG and Perry, the swordmen are OG and the swordmen in vest is foundry.

The drummer and flag bearer are OG

Cheers
Björn