[G0HZU_JMR]

One thing to note is that there appears to be at least three almost identical revisions of this PCB artwork for sale. At first glance the PCB layout looks the same on all of them but the difference between them is the amount of ground vias near the MMIC and also around the supply decoupling caps. On close examination, the version in the picture Bazz posted up in the first post appears to have the best via pattern of all of them. However, it still might not be fully adequate. But it's a lot better than the others. There is also a board for sale that has a similar MMIC on it but with an obviously different PCB shape and design and this one looks even worse than the others in terms of the MMIC grounding.

So it's worth looking for the version with the most vias around the MMIC as this is probably the latest attempt at keeping this MMIC stable when used in real world applications.