I use the ribbon and A 198 module in compliment with an expressive E Touché to replicate the control of the Ondes Martenot.
The controller is very responsive and the tuning ability of the module allow quickly to make it your own, switching between a 3, 4, or 5 octave range.
I hesitated for a long time with an Eowave ribbon but I've chosen this one for the analog only path and the responsiveness of the touch.
As I wanted to play mainly tonal music with it, I was at the beginning a bit scared that there was no markers, but a bit of time spent tuning it with my oscillators and a few stickers ended up actually better. I could make it more precise and completely in tune with my specific case and oscillators. I don't use the pressure aspect of it much as I found it to be too unprecise for my liking. When I do it's for very subtle effect and range rather than a deep progressive one, which I'd leave to a modwheel or to the Touché, but for pitch or whatever you want to do with the left right control it's perfect.
In 5 months I have no complaint with the build quality so far.