IMHO the cause of the delay is 3dr make sure the gimbal perfectly calibrated, vibration test, firmware tuning enhancement, etc i hope you guys give more patience.
I agree that the are trying to make sure the gimbal is top quality but lets be honest to ourselves as well, 3DR wanted to get to market with the Solo and in my opinion they jumped the gun and have had more than a few hiccups during there release (I was not really impacted as I just walked into a Best Buy and picked up a Solo but those that pre-orders back in May are still waiting).
If you can post pics of the Solo in Malta, you can provide you customers and potential customers a quick update on the Gimbal (you know the Gimbal they are using the shoot still and video in Malta
