Having used the previous model for quite some time, I decided to "upgrade". I wasn't disappointed. Installation was a doddle, the Solar panels connect easier and have the benefit of hanging from the bottom of the "Gizmo" without the need to stick them to a curtain, plus they can be angled too.
Without doubt the motor is more powerful than the previous model and in silent/slow mode, you can be standing right next to them and wont hear a thing.
Adding them to the current App is also very simple, setting up, just like the previous model.
However, (aww, c'mon, there has to be an "However"!) The One thing that is missing from the new model setup is the ability to open/close the curtains according to the strength of Sunlight! Once I got my head around this feature on the previous model. I was able to make sure that after the initial opening of the curtains, if the Sun was too bright/strong, the curtains would close until such time as the Sun had moved round. This prevented my bedroom from getting too hot. There is a note in the App that this feature is being sorted out and I look forward to it happening soon-ish, I mean Summer isn't all that far away chaps!
If you're thinking of upgrading your current model 2, what are you waiting for, go for it! If you're new to the concept of automating what can be a chore and sometimes oversleep the Alarm clock! Then the auto opening and immediate brightness of the early morning Sun should help.
I would recommend the Solar Panels, but the battery can be charged up using a normal phone charger and will last a long time. On the previous model I charged one up more as a top up as it didn't get the same amount of sunlight like its partner and charging only takes a few minutes.
All-in-all, a very nice bit of kit.