Works great, especially baltic birch ply.

The only thing to be careful of is to plunge a bit slower as plywood seems to grab the bit more than solid wood.

I don't think I've joined any wood product that wasn't man-made yet!
I think every hole should be plunged at moderate speed.
And now, a bit of poetry.

"Remember the goal is a toleranced hole"

I have a whole book of Festool poetry

I will share at the appropriate time my verse and rhyme about a black tailed wasp covered with dust and grime. Of course if you really make me flex I'll show a shot of my caped pex.

Paul,

No problem at all with inserting the dominos into the cut ends (parallel to faces of the sheet).  I recently made a couple of cabinets from cheapo 3/4 inch birch plywood using 5mm dominos.  The major issue I encountered was a need to slow down when cutting a mortise through the face veneer to minimize tearout.  But since that damage was covered when the pieces were assembled, no net problems.

Dave R.

I made the same mistake - once - while making the shop cabinets.  After that, I decided it was preferable to first insert the dominos into the end grain pieces, then "coax" the sides on with a mallet.  One thing is certain, once you have wetted the 5mm dominos with glue (Titebond in my cases) and begin assembling the joints, be sure to drive them all the way home quickly.  If you stop even for a short period of time without the joints being fully seated into the edges of the plywood box members, you will greatly increase the likelihood of one of them blowing out through the outside face of the members in which the dominos penetrate a face of the plywood sheet.

Dave R.