I would rather dip my genitals in a piranha tank at dinner time than buy G-Max suspension. I've seen on several of their kits cracking round the spring platform. I know of one guy who has actually suffered a failure of the platform and know at least one trader who won't sell them because of this.
Save an extra £40 and buy the SPAX kit
Those that rave about the truely shocking kits are usually those that have never driven on a halfway respectable kit and compare the feel to their old 10yr old standard setup.