We have a samll startup company in Irivne/Mission Viejo area and our server went down last weekend. We called our regular guy and he said it sounded like a power supply problem but was not willing to come out to fix it. We had orders to fill and get ready for Monday, so I found these guys, Guardian Networks on Google from my iPhone and called them up. They aggreed to come out in and showed up in about 45 minutes on a Sarurday so that was a big thumbs up becasue everyone including me was just sitting around with nothing to do, even internet was down. The technnician came out and seemed very knowledgeable and made us feel at ease that he knew what he was doing. He confirmed that it was the power supply, and then went out and got a replacement and put it in and everything started working again. I give them a big recommendation first for being available weekends and their fee for the repair was very low in my opinion. They didn't even charge extra for that or tack on travel fee, etc.
Pros: Open on a weekend