passat 2.0l 8v agg info

[psyco]

hi wanted to know if any one knows any info on big valve heads i found a site called www.cncheads.co.uk and found out that it will cost £1200.00+vat (£350.00 exchange) is it worth doing or not to get that extra bhp & will it work well with a fast road cam?
someone shed some light on this situation!!!!!