The SIMs work. Though my first eggs that are going to hatch in them are Laticinctus ratsnakes, they eggs have done wonderfully. Right next to eggs not in SIMs that I've had to fiddle with a bit to keep them going strong. For anyone thinking they could throw together the same idea, sure, but you can't match the total package. The SIMs are easy to use in a pinch, go together fast without any thought, and the entire container is great for incubating even if you don't use the "no substrate contact" method.
Just waiting for a little deeper model. Would have used them on some other colubrid clutches, but the eggs were laid in a pile and the lid on the SIM doesn't have enough clearance. That's how I know they are good containers even if you don't use the grate, and do it the old fashioned way, lol.
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Brian Suter
www.serpenteer.com