Greg, I bought my Stages (Ultegra 172.5mm crank length) in July.
I bought the unit from TBE Myaree. Received a unit in a box marked 172.5mm, but the unit inside was a 175mm unit. TBE re-ordered and swapped (about a week turnaround).
Initial problem with battery life turned out to be a poor connection inside the unit (battery terminal plate). Fixed easily by lifting the connection terminal up slightly with a pen knife. No other issues.
Stages online help (FAQ and email) very good.
Great unit and would recommend to anyone wanting a value for money PM.
Regards Liam