Old and In the Way
The standard screen was falling out, or dumped with the spent load. The metal casing can slip off too easily. These other screens eliminate that metal casing and they stay in place better, in that little recess in "the little silicone thing".What sort of performance improvement does the dynavap screen or ddave screen provide?
So, not so much performance improvement imo (though I have not tried the Dynavap screen), simply a design upgrade that makes the screen a bit more reliable.