The adapter can I use third-party lenses for A-mount. So I've bought a macro lens with a longer focal length than 30mm. The 30mm Macro Sony was me "shortly" to.
The adapter is well made and fits well on both bayonet connectors. Almost exclusively, I use it on a tripod with my new macro lens Tamron 90mm f2.8. Here I present almost always focus manually. The AF is a mean disaster because the Schrfstellen relatively long takes (1 to 3 seconds).
Long story short. I would recommend buying the adapter.