I have been using the services of Sigma - professi...

I have been using the services of Sigma - professional engineering corp. for the past year and I must say they provide an average service. The overall quality of their work has been satisfactory, but there is definitely room for improvement. They have been prompt in responding to my queries and addressing any issues that arise. However, I have noticed some inconsistencies in their deliverables. I would appreciate more attention to detail in their work. Overall, I would rate them as average.