You should be careful about them. They have "ordination" of women as priests and bishops. This places the validity of their sacraments in doubt.
That is a case study in how you can go from right-wing extremist (excuse the modern loaded buzz-word) to left-wing extremist.
The Old Catholics presume to reject Vatican I and the Catholic Church that followed this Ecuмenical Council. So they are more traditional than Traditional Catholics, right? Extremely right-wing or conservative. No one is more trad than them!
But they ordain women? Guess what -- The average Novus Ordo layman/priest/bishop is against that. So your behavior is roughly in line with the extreme liberal elements in the Novus Ordo.
That's how the devil gets ya.
Likewise, I know a Traditional priest ordained before VII that got himself consecrated, and proceeded to ordain one man a permanent deacon. Permanent deacon? Is that traditional? Of course it isn't. It's a Novus Ordo novelty. But this priest, extremely conservative, flipped over into this error.