Workmanship is top notch and they stand behind their work. Technicians are friendly and professional. I would have given these guys 5 stars except for one issue. The reason I didn't give them 5 stars is because the product they installed didn't accomplish what I was told it would. I was very clear about my need. I own a fitness studio and I needed to make the room dark. Sun Pro recommended a tint they claimed would block 90% of the light. After installing the tint and $3K later the room wasn't much darker than before the install. I informed them of the results but no resolution was offered other than doubling up the tint.