The Scarlett 18i20 is the perfect interface for experienced engineers and beginners alike. It is incredibly easy to use, has tons of I/O, and great sound! The preamps sound good and can handle quiet mics too like the SM7B. 8 aux outputs allows you to incorporate outboard gear as well. The two headphone outputs can be set to different mixes so live tracking is completely possible with this interface. I've had mine for 4 years, not a single issue!