This place is quite reliable and takes pride in its quality of work. Many customers praise the staff for being responsive and knowledgeable. Customer service is a strong point for Keller Custom Signs, with some clients mentioning that they received good referrals when needed. The company seems to be experienced in handling various types of signage projects, from designing to installation, and many customers appreciate the attention to detail in their work. Some even praise the staff for being professional and easy to work with. However, there have been a few complaints about the staff being rude, and the company requires appointments, which might be inconvenient for some customers. Despite this, the company has mostly positive reviews and is highly rated overall.