That's all I use unless I run out and have to use my 'emergency' solid bottom boards that I have not modified to SBB yet.
If I remember correctly I bought some #7 hardware cloth, (still don't understand why they call it that, the hardware cloth part not the #7 = 1/7") I'll need to remeasure next time I'm out there. I have found pollen when I have used a tray, but it has been so little I just assumed it was from when one bee passed it to another and every once in awhile they would drop some. I haven't seen any getting caught in the wire. I have seen them occasionally pass forage through the screen.