Folks
Many thanks for the above, a useful thread for the forum as well as for me I suspect.
Quick update; I took the advice of a few posted and went for dbx, specifically the 160xt.
Does it make a difference you ask? Hell yes! My slap playing sounds tight, and whilst my pop has always been pretty competent, what used to be a very inconsistent slap is now not only more consistent note-to-note, but also is far more balanced volume wise with the pop (I guess none of this is exactly news however, it's what compression does after all). It might be an artefact that I will want to lose as my slap technique develops, but the compression adds a discrete but quite reassuring kick drum-like oomph, a percussive edge that - whilst I'm practicing solo at least - is really rather pleasing on the ear. I'm going to use my Beat Buddy in practice from now to ensure that I'm not getting a little bit too much oomph.
Thanks again for all of the advice above, great thread