I used an Apollo 8 and Satellite for a few months (connected via Thunderbolt-3). It was rock-solid. Round-trip latency is about the same as the best USB-2 audio interfaces (not UA's forte'). Also, I didn't care for the onboard DI's.  To my ears, they impart an exaggerated "tubby" type tone to DI guitar. IMO, not flattering to the guitar (especially when using amp-sim plugins). That's why I moved to an Antelope Orion Studio Synergy Core.