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You are probably comparing the Octagon 40 with the Octagon 20 EX
The 20 EX is expensive because it has built in auto-humidity, which is an expensive option on the Octagon 40.
I had an Octagon 20 in England. To my utter disgust I left it there when I moved to the US.
Two things about the 20 that some don't like. It turns the whole incubator, not just the eggs, and visibility through the top can be less than perfect.
On the other hand ....... features in common with the 40 are wonderful temp control, easy humidity control, near indestructible build quality (despite the flimsy *feel* of some parts ... versatility .... Parrot breeders trust their very expensive eggs to them.
You will not be disappointed with an Octagon 40. I would buy one in a heartbeat.
I also like the GQF Sportsman, and the R-Com, although the biggest R-Com is 20 egg, it appeals to the Geek in me
ps ... it's not really fair to compare these incubators with the Styrofoam ones. GQF and LG have produced machines for years that give reasonable success to many who simply couldn't incubate without them. The incubators you are considering are moving into the realms of Pro machines.