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The original ASI 294 had problems, you mentioned it's AMP glow but it also had sensor cooling issues due to its backlit architecture ( the sensor could not be cooled evenly, and a smaller cooler had to be used), this resulted in uneven cooling and gradients (which made Flat gymnastics necessary for any long sub use). The ASI1600 could be used without flats easily. The 294 is primarily used as a planetary camera, where high frame rate video can be used, and cooling and AMP glow are less of an issue. The Electronically Assisted Astronomy EAA guys also like the 294, for real time stacking video. Better choices than the 294 for traditional long sub capture.
If the Panasonic mono chip in the 1600 has been dropped, they will become real collectors items. Sorry I sold mine now.
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