I use one of those on a Mitsubishi TD04, holds 1.5 bar rock steady no problem with no spikes etc. It replaced a Blitz DSBC which had loads of great features that I never used so I sold it for nearly as much as I payed for it and bought the above for £15 then spent the other €160 on tyres(who really ever changes between boost settings on a boost controller and why do they do it ??)
have a apexi avcr there mate if your looking for one great piece of kit with all the settings you can change..