The idea of the Wersi keyboard or system is simply great. It is an all in one solution for musicians. The problems with Wersi are mainly the following two: 1. German companies are really great if it comes to developing new gears. Production and Marketing for them is a far bigger problem. This is simply because they do not have the infrastructure to do so. Although the European market is a large one no european company is able to produce a newly developed gear in the demanded number. Not Wersi, not Dr. Boehm - another German company - and not even Sotlton.
2. The company Wersi started business with producing build-your-own-organ-sets in the 1970's and 1980's and selling real big and expensive electronic organs for entertainers. I remember the 1978 football world championship where Franz Lambert was carted into the stadions with his big Helios organ stationed on a kind of a truck and played some warm-up tunes. From this time derives an overall loyal set of customers, mostly between 40 and 50 years of age. They used to and would nowadays pay any price to get a Wersi instrument.
At the Frankfurt fair I had the opportunity to check the instrument: it was a real disappointment to me. The organ sounds are great but the patterns are weak, the sounds are average and the whole handling ist awkward.
You would do much better if you combine a Yamaha and a Solton or a Technics.