Rollock's commentary on Ephesians earned him the praise not only of Theodore Beza but of the wider world of Reformed communities. This commentary was his first link to Geneva and thereby the broader international Reformed literature. Beza's praise is well 'I pray you, taken it to be spoken without flattery or partiality, that I never read or met with anything in this kind of interpretation more pithily, more elegantly, and so judiciously so as I could not contain myself, but must needs give thanks, as I ought, unto God, for this so necessary and so profitable a work.'
I got an inexpensive eBook version of this commentary in the recent RHB sale. We definitely need someone to translate more of Robert Rollock's commentaries out of Latin and into English. As you would expect from this Scottish divine, it is a mixture of good exegesis and solid doctrine. Rollock argues for a view of Christ's mediatorial kingship over all creation that was at odds with later Covenanters such as George Gillespie and Alexander Henderson but in line with scripture. Despite his respect for King James VI/I, Rollock takes a Presbyterian view of "bishops" and of church government in general.