One week status.
Case is waterproof. Was outside for the better part of 6 hours on Tuesday lots of calls during the heavy rain.
Tested it in a bucket of water. No issues at all in the wet conditions.
Battery which is build in to the case allows for the iPhone 4s to last for 2.5 days with no topping up.
This is really great news as I am a heavy user.
The bad.
Because case is waterproof the unit is very hard to hear ringing. I use the Old Phone ring tone at max volume.
Also when using the phone with the case, case acts like a echo chamber. When people call they complain that they can hear a nasty echo.

Because the case is air tight I use the speaker option when people phone, better option to hear the conversation but now I need to yell at the phone in order for the other end to be able to hear me.
This case must be used with a bluetooth headset in order to be able to carry on a conversation.
Otherwise the phone will need to be pulled out of the case, so ear piece is a must.
If the waterproof part is not important then one could drill out the area where the phone's ear speaker area is which might help stop the echo.
That all for now.