Originally Posted by: Dr_simon Why not get a GT6 or a ME50 ?

Well the answer is control.

I can tweak any parameter, put the pedals in order or combination or cut anything out the loop entirely during song composition.

I have the good ol' GT-3 , and it can do everything you've just said , from putting effects in any order, to the parameters ... In fact , there are usualy more parameters in some multi-FX units than the real pedal.
For example : Phaser , the PH-3 has 4 buttons , on the GT-3 there are 8 parameters .

The problem , is that not all effects are available simultaneously , but they're arranged in groups that people don't oftenly use together .... For example , the compressor and the limiter are in one group and so is the feedbacker and the anti-feedback , you can only choose one ... I can live with that.