I have the latest version of the OF S45HP. After using it for about 5 months, I've come to some conclusions about the radio.
I don't know about other S45's, but my unit had very sloppy factory alignment. Right from the get-go, my clarifier had to be set at about the 11:00 position to center it on frequency. Second, the FM receive was poor, because the discriminator was not properly aligned. These are both very easy fixes if you have the alignment instructions (attached).
The other issue I have is the uP occasionally glitches, i.e.: the button group stops working. Simply turning the radio off and on fixes this, (unplugging the radio from DC for a minute is useful too). It only happens rarely.
Once these issues are addressed, the radio works great.