I don't have their mono but earlier this year I sent my A7s for it to be modded. I've got limited experience with astro DSLRs but I'm happy with the Astro A7s mod they did.
It cools down as per advertised - down to -18C -> -20C. If there's anything I do wish it could go a little cooler. Any other limitations, is with the Sony itself, not the mod CDS did.
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