Looks impressive.
Is the Outback cooler actually regulated and is the temp measurable at all?
The only concern I'd have with such a setup is thermal runaway. When you boost the initial cooling so high, the fan works over time and never actually reduces the temp.
Even with cooled astro CCD cameras this can occur. Many manuals recommending setting the temp to a mid point i.e. -20 degrees, then move on to -35 degrees or what you desire once the camera has reached the mid point. Setting the camera to -35 degrees immediately can cause the issue.
Slightly off topic, but I've read on numerous forums that actually cooling a chip beyond a threshold actually delivers no further reduction in noise. Interestingly, many people believe the cooler you go, it will yield better results. The threshold is based on camera/chip combinations. Most manufactures have this information on hand.