Yes they are stackable. The question is, is it wise to stack all of these at once. You realize that is 1.5g right? plus an oral. Instead of stacking everything in your arsenal, perhaps stack the sust with the deca for a bulk and then stack the EQ and winny for a recomp or cut. There is no need to run it all at once, you can gain just fine on test/deca (plus maybe a kickstart like SD or dbol), and cut/recomp on EQ/winny.