Dont get the FY6600 ,they have a new model now FY6800 . I own one of each , yeah sure if you read the posts there are some unfavourable comments ,but mostly to do with earlier software versions of the Fy6600 where there was an issue. And many other 'Knockers' getting in for a low blow on something they never even set eyes upon .
Fy6800 has online update capabillities , a better keypad and a properly grounded mains connector and all the upgrades for the Fy6600 like psu, output op-amps etc work on the FY6800 too .