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They are down to 2 main problems now. The main one is (the cost of) scaling up. Fusion reactors will be more effective then bigger they are. The tiny test ones are already past break even.
The other is wall material. Apparently the radiation has an annoying ability to transmute the elements making up the wall of the reactor. They are working out a material that can maintain its bulk mechanical properties, even with random elements appearing in its internal structure.
The only one I heard news about breaking even was that thing that shot a lot of lasers to a pellet. For a fraction of a second It broke even or produced slightly more than they poured in, but it was much less of what they spent.
There's been something else new?
I saw a talk on the subject about a year back. It was discussing tokamak reactors, from an engineer working on them. The small ones can't sustain a break even state, but they are affected by the inverse square law to a larger degree. I believe China is about to start/has started construction on a power station sized test reactor.
The pellet sort are a different type. They have different pros and cons.