Firstly, the proprietary charging port with delicate/expensive connector. I've yet to try and plug it in yet, I'm scared of breaking the pins!
You won't break the pins - just make sure the little notch on the connector is aligned with the slot in the port. You don't need to force it - you'll feel when it's ready to be pushed home. It's really no more difficult to get right than micro USB IMHO.
Thirdly, I can't get the MyCampy app to pair so I can do a firmware upgrade. It initially saw the EPS and then crashed and has since never detected the groupset again.
Try this, I had a similar problem and it worked for me:
1. Close app. Unpair phone and delete EPS unit from connected devices if necessary. Turn off bluetooth.
2. Turn off EPS with the strap. Wait a ten seconds or so and then remove strap to turn back on.
3. Turn on bluetooth and pair again (be sure to include the leading zeroes in the passcode).
4. Start app and connect in 'My EPS'. Run update.
I have found that problems connecting to the app are usually solved by turning the system off and on again with the strap. Remember to press the 'mode' button as many times as necessary to prompt the EPS bluetooth connection.