Perforated Drum Roasters, such as the Vittoria and the larger Burns 23R, are capable of profile roasting and producing nice coffees. However, for darker roasts that produce more build up within the roaster, the build up will reduce the openings within the perforations over time. This will affect airflow and the consistency of the roast batches. For Burns 23R Roasters, "Automated Clean Outs" are required on a regular basis to ensure the perforated hole openings are maintained. I'm not sure of the capability to clean the perforations on the Vittoria.
On a Solid Drum Roaster, the build up does not affect the airflow as significantly. Consequently the roasts should be more consistent over time.
On a Solid Drum Roaster, the build up does not affect the airflow as significantly. Consequently the roasts should be more consistent over time.