Anyone ever used the Mojo peep type sight on their AK?

I was curious as to how well it worked with the aperature so far forward.

Any accuracy improvements?

I've got a Mojo on my SAR-1 and I like it.  
The groups tightened up a bit - at least enough to notice.
I really like the adjustability of the Mojo.
I bought mine off of one of the auction sites and only paid $15 for it.

Is there any other peep style sight besides Mojo?

I think Krebs has one.

The Mojo requires a hex wrench for adjustment and the Krebs is basically the stock leaf sight with a rear 0.15" aperture.

The Krebs is $50 shipped, Mojo is $40 shipped.

IMHO the Krebs leaf sight looks like a great stock replacement sight, but for an extra $10 you get the adjustable elevation slide which to me is useless since 7.62x39 won't even hit a point target at 1000m.

The Mojo looks like a much better choice since once you're zero'd in, you'd be all set and its windage adjustable (Krebs isn't).