BATFE Curio and Relics license interview?

I applied for a C&R license a few weeks ago to occasionally buy some older firearms and to get the dealer prices from places like MidwayUSA and Brownells. Someone from the ATF called me this morning to set up an interview. Have any of you with the C&R license gone through this, and if so what was it like? I don't have any criminal history but I do live in an anti-gun state (CA). Just wondering what to expect. Thank you