Any one have any experiences of this subchassis?

http://www.fidelitydesignsltd.co.uk/...timatesub.html
the above is a new product with integrated arm board, there is an earlier version:
http://www.fidelitydesignsltd.co.uk/subchassis.html

Low mass and low price seem to make this an interesting option, although I would guess that the low mass would make setting up very different to the "norm"?