Premiere is a line of Series 4 Tivos. There is 5 different models, identified by their model models with "TCD"
Premiere 2 tuners, works with OTA, analog cable, digital cable.
TCD746320, with a 320GB drive
TCD746500, with a 500GB drive
TCD748000, with a 1TB drive (Premiere XL)
Premiere 4, 4 tuners, only works with digital cable.
TCD750500, with a 500GB drive
TCD758250, with a 2TB drive. (Premiere XL4)
I think I got it all right.
Series 2 (PLS, sold)
TiVo HD 1TB (157 HD Hrs, PLS, "652")
Roamio! Oh, wait, Its Juliet!
OTA! OTA! OTA!
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!