As a company we have tried several IT management companies and find they have a delayed responses, never seem to have the answers or it is something you are doing wrong, however since we started using BOM earlier this year they have proven me wrong.
BOM are very responsive generally well under an hour, polite their phone manner is friendly yet professional, helpful and do not make you feel silly for not knowing even some of the simple things as we are not all IT geniuses surprisingly. I have also found with BOM that even after your problem is resolved this is not the end of their care as a day or so later they will make contact to check everything is still ok. I would highly recommend BOM for any IT needs, Abbie at Sovereign Fire & Security.