My understanding is that they are heavy 50’s Catholics. I have a chapel near me but never went. I have a friend who attends there, and loves it but he’s a 50’s Catholic too. They also are heavy on BoD. I hear Bp Pivarunas excommunicated someone for rejecting it? Could be wrong. 

My understanding is that they are heavy 50’s Catholics. I have a chapel near me but never went. I have a friend who attends there, and loves it but he’s a 50’s Catholic too. They also are heavy on BoD. I hear Bp Pivarunas excommunicated someone for rejecting it? Could be wrong.

Yes.  You are wrong.  If you want to find the truth, go to the nearby chapel and see.  If you don't want to know the truth, at least stop spreading rumors.

Do they insist on accepting 3 ~ 4 Baptisms like the SSPX?

Well, their publication TWICE published an article entitled "The Salvation of those outside the Church" ... a direct word-for-word contradiction of Catholic dogma.

Well, the Dimond Brothers think they are heretics, so there's that.  

If Bro Peter says so, that does it for me!  

There are many CMRI chapels in the Minnesota area and they very strongly preach 3 baptisms.

Is a CMRI chapel a reasonable substitute for a Resistance Mass?

Just wonder what the Pros & Cons are with this sede group?  

Are they adamant about enforcing their sede-vacantist viewpoints with their faithful?
Do they insist on accepting 3 ~ 4 Baptisms like the SSPX?

Historically, it looks like CMRI got off to a bad start.
But they had a major house cleaning and used Archbishop Thuc's line to validate their Orders.

Any thoughts would be appreciated.

They inherited this from the SSPX and the Archbishop.  It is a very important hole in their theology. I get along with SSPX types by never discussing this with them. If your view of salvation is defective then everything else that you teach is suspect, but if you can get valid sacraments from them, then you should avail yourself while it is still possible, because you face the same problem with resistance priests. We do not live in times, where we have many good options.

I've read where they adamantly believe in Salvation Outside the Church.

So for the multitude of ways to accomplish this, they accept:

1. Baptism by water.
2. Baptism by desire, without the water.
3. Baptism by blood.
4. Implicit baptism (everyone is automatically baptized in our hearts) AKA Karl Rahnerism.

The SSPX believes in #4, but not sure if CMRI goes this far?

I believe it was Fr D Radecki who stated a Jew who rejects Christ can still be saved.  
"All infidels are damned" - Pius X
They are by far the most liberal trad group I have ever encountered.  Out of the ICKSP, SSPX, Resistance, Dolan/Sanborn/Cekada group, sspv, they are the most liberal in all aspects of the faith and morality.  The overall intelligence of the priests and parishioners seems to be lacking.  A typical cmri church is less modest in dress than a typical Indult group for instance.  They push a heretical BoD and Novus Ordo NFP heavily.  They hold an utterly simplistic view of the crises in the church.  Sermons are lacking in philosophy and real substance.  Many members are completely a part of the world; tv, sports, drinking.  
On the other hand many priests seem to be trying very hard in getting the sacraments to as many people as possible, and try to be as holy as they know how.  Many parishioners are truly holy too...but very far and few between.  
This is my opinion, and not a jab or ridicule, but a strong critique of their organization.