Quite Knowledgeable of the Equipment & Programs

I wish to complement your firm and its personnel for their help and efforts concerning my purchase of a new computer.  They were quite [knowledgeable] of the equipment and programs and showed a genuine interest in my particular problems. Specifically, I would like the thank Jonathan for his efforts, as he not only installed the equipment quickly but also explained answers to my problems at a level I could understand.

Thank you all for making my purchase an enjoyable experience.

purchase of a new computer