Hi!
I am playing the Wersi Abacus for the last three years and I will update it to the latest OAS version 6.0 in the next two months.As far as I know the Icarus has essentially the same features like my Abacus
-except one Microphone input- but on the other hand it comes in a much lighter/smaller cabinet and features a 72-keyboard instead of the 61 of the Abacus.
The sound and the facilities- mainly due to the built in Windows PC- of these instruments together with the proved upgradeabilty ,puts them above the rest IMHO.
Apart from the OAS Stereo samples I am using VST instruments live from within my keyboard!
And NO, there are no problems with WIndows exept if you really want to create one!
The combination of the big touch screen,push buttons and 32 real time faders makes
real-time operation very easy and fast.
If have any specific questions I would be happy to answer.