[Edited by Moderator]
I personally have no problem attending a Mass other than one celebrated by the SSPX, but with the condition that priest is not a liberal/modernist, and everything is done with reverence.
I often attend an FSSP Mass when I am traveling (last Sunday, for example). I have always been very impressed with the priest and the sermon. I also love the Mass at St. John Cantius in Chicago. I don’t attend an SSPX mass because it says SSPX on the sign, but because it is one of the only choices in the area.
Personally, I will attend a Traditional Mass anywhere as long as the priest is not liberal and it is done with the proper reverence. Why these two requirements? Because, like it or not, we are influenced by the priest (good or bad), and lack of reverence is damaging to our personal piety and faith.
In a crisis such as we have today, when Rome allows the wolves to do as they please, our first duty is to protect our faith.
Don Gueranger: “When the shepherd turns into a wolf, the first duty of the flock is to defend itself. As a general rule, doctrine comes from the bishops to the faithful, and it is not for the faithful, who are subjects in the order of faith, to pass judgment on their superiors. but every Christian by the virtue of his title to the name Christian, has not only the necessary knowledge of the essentials of the treasure of Revelation, but also the duty of safeguarding them. The principle is the same, whether it is a matter of belief or conduct, that is of dogma or morals” (The Liturgical Year).