A "real" reply to Fr. Cekada's position is John Lane's article here:
http://www.strobertbellarmine.net/una_cuм.html
I recently had a pretty lengthy set of emails with a traditional Catholic who shares Fr. Cekada's position on una cuм. He was (and remains, I believe) very entrenched in it and seems to especially "hang his hat" on the fact that no traditional priest has written a rebuttal to Fr. C's "Grain of Incense." I told him that rebuttals have been written, they were just written before "Incense" was. Anyways, as Mr. Lane points out, it seems that Fr. C is hanging his hat on the same rack, i.e., pointing out the fact that no priest has written a rebuttal to a specific article of his.
The una cuм controversy, so far as I can tell (reading both "sides") has not had any new evidence added to support it-- perhaps more evidence has been added to the pile, but the essential argument remains the same and rests on proving that the "una cuм" clause in the mass is an all-inclusory expression of the same faith as the one named. If you prove this, the rest follows and "una cuм masses" really would be an abomination and an act of apostasy in some cases. However, failing to prove this point mitigates all subsequent reasons for not attending, since the inclusion of [antipope x] is "merely" an error of fact, and as morally significant as if the priest named a pope who had died three hours before he celebrated mass.
Anyways, the essential argument has remained the same, so there really is no reason for Fr. C to use the fact that no one has replied to a particular article when the arguments he uses have already been replied to before he even wrote the article. Besides the earlier linked article by John Lane, a good "primer" article would be Mr. Lane's interjections to + (then Fr.) Sanborns "VII, the Pope and the Mass"
http://www.strobertbellarmine.net/interjections.htmlAlso, an article written in the early nineties by Fr. Lamoureau in response to an earlier article written by Fr. Belmont, published by Fr. Barbara in
Fortes in Fide:
http://www.scribd.com/doc/188335648/Una-Quicuм