The Wersi Abacus has come on leaps and bounds since I first viewed a prototype at Brett Wales's house (he is a Wesi demonstrator). Personally I prefer Genesys and it's far cheaper, but the Abacus is definitely a contender along with Genesys, Tyros, SD1 etc. My mate uses Abacus and has latest software update, there are some superb samples you can get for it but I'm not keen on Wersi styles.