Philippe, I owned a 3 axis brushless gimbal (based on Alexmos) for 1 year.
It was easy to operate, but it was quite time consuming to balance if I wanted to switch lenses.
I sold it and I bought a Beholder DS-1, which was more then difficult to balance and I sent it back.
I tried the Ronin M, it is great, but it is heavy and you need an external monitor to see what you are filming. And 99% of the time you film in a lower angle then you would.
I tried the Zhiyun Crane which is really great (especially because it is not based on Alexmos), it has a great app for iPhone etc..., it is 99% perfect for all shots you have in mind, super stable, great feeling, great quality but it has a huge problem: it has no assistance in Italy, so for any little problem you have to send it in China.
So I wait a little and then I decided to return to a mechanic steadycam.
I've bought the Flycam HD3000: it is cheap, it has great quality, fine controls and it is super easy to balance. Of course you have to learn how to operate it, but the results are really good. It does 90% of the things that a Zhiyun Crane does.
And it has no electronic inside, so it is more reliable.
If I break it I can buy another for the price of sending the Zhiyun Crane in China, more or less.
I think I'll buy a motorized gimbal when they will be more "mainstream", easy to balance on the go and reliable.
In the meantime I'm happy with the FlyCam HD3000 :)
After using a couple of electronic gimbal I returned to mechanical: I bought the FlyCam HD3000 from MovoFilms in Belgium. Great shop.
It is the same as Glidecam HD 4000. Fine tuning, everything. Excellent built quality.
I took the one with Camtree Vest, but I use it also alone with GH4.
Also the HD 5000 is great!
I came from a Canon 70D and I was more happy with a Panasonic G6, now with a GH4 you can imagine :)
And you have more opportunity with old primes such as Canon FD that you could not use on 70D.
I would buy a Panasonic G7 or a GH4 with a native m4/3 12-40 Olympus and some nice old manual primes (Canon FD, CY Zeiss, Nikon...) with a 10$ adapter.
In this video I used a mini LED (10 € http://amzn.to/2aTVlf1) in the car, just to let the camera see the actress face.
For the external shots we used the street's lights and an Youngnuo YN600 for the people that come out from the car.
I would buy the Olympus 12-40 f/2.8 Pro. A great lens!