I will concur with what X-Ray says except I would modify one of his statements to read "most users have broken doors". The original C= case, while looking pretty clean / visually pleasing, had issues with the door hinges and the clasps that held in the smoked window. Most of these problems were resolved when enlight provided the newer case during the Escom / AT era.
The original case doors were so bad that around NewTek, it was not uncommon to see the towers with doors removed.
Regards,
Ltstanfo