Using images from Subaru and spectroscopy from Keck, the SLUGGS survey aims to understand the formation and evolution of massive early-type galaxies. For a sample of 25 galaxies, we probe the detailed kinematics and metallicities of their field stars to 3-4 effective radii and their globular clusters to 8-15 effective radii. From these data we have derived 2D maps of the halo stellar kinematics and metallicity. We find changing kinematic signatures as we probe from the galaxy inner to halo regions. Using JAM models we have derived the mass density slope and compare it to the latest cosmological simulations. The SLUGGS survey has also collected over 4000 globular cluster radial velocities (the largest sample to date). From this data we have derived the dynamical mass and dark matter fractions for our galaxies. We compare our results with the latest predictions from the Illustris simulations. We also explore the kinematics and scaling relations of globular cluster systems. These results are placed in the context of two-phase galaxy formation. And if time allows, I will briefly mention recent work on ultra-diffuse galaxies using the Keck telescope.