Nope but I'm seriously tempted by the talk of 700W UcDs for around 200Euros per module.Here is the sheet for the UcD400 - the 700 is the soon to be released Big Brother
http://www.hypex.nl/UcD400.htm
Looks pretty good to me - linear frequency response across the board and about 1% THD at full rated load...
high efficiency (>92%) means it shouldnt struggle with heat issues or the like either.
Josh