Product review (4 stars): Maybe: Do not buy (See the update)
I bought one of these freezers (not through Amazon =/ ).  My certification and mapping company charges $1500 for the service, pass or fail.  The freezer would not go below -17.  So, not only did I waste the money on this freezer, I wasted another $1500 on the failed certification because this freezer would not go to -25.  Even on the "super" setting where the compressor never shuts off, -17 is all you get.

Yeah, I'm angry about this.  I'm angry at Summit mostly.

Update 01 Aug 15:  the freezer started working, holding -30 just like it says it would have.  I turned it down to -20 and it is holding well.  Very well in fact.  Why it took a couple of weeks to start working great is beyond me, but it is working great now.