Here'a a couple pics of mine. I took the back panel off and you can see the guts of the incubator. In over 20 years the design has changed very little. There are built like a tank. The only difference between mine and the 1502 is the 1502 has a programmable digital thermostat.
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I wanted a GQF sportsman 1502 but didn't want to spend $750. Well I ended buying 4 old GQFs (3 1266s and a 1250) for $1000 and I sold 2 of them.
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It really depends on what you want to do. These incubators hold 250ish chicken eggs and 1200ish quail eggs. I currently have 260 quail eggs in mine. The table top brinseas look nice and probably work great. If you're only doing a few eggs here or there I might could see buying one. But if you're looking for a large capacity commercial incubator that has a proven track record I highly recommend the GQFs.