I have no Holga -- indeed, I have never even held a Holga. However, I have an Ansco Pioneer 620, which does a fine imitation of a 6x9 Holga; I also have a Polaroid 250 that will make instant prints with a little Holga quality to them (though the lens is almost too good, the camera is well nigh impossible to hold really still, and doen't have a tripod socket).
Oddly, the closest camera I own to a Holga in terms of original cost and build quality is an Ansco Speedex Jr. -- fixed focus double meniscus, f/11 to f/32, T and I (about 1/25) speeds -- which makes perfectly wonderful 6x6 negatives. It's the second such I've owned, the first felled by an overworked door latch that, one day, simply fell off. I should probably buy 2-3 more...