Viglen do more than just schools, or they'd be dead in the water. Their ClassLink junk isn't worth the paper, honestly. I've specced school networks with Viglen hardware (server + client, actually rebranded Dell at the time), but never used their software.
However, I just heard that either Viglen took over XMA, or XMA took over VIglen (I think the former). XMA were quite big but they, too, were useless.
Three months after asking XMA to big for a complete print solution for a private school, they phoned me up to tell me they'd go us confused with a similar named school at the other end of the country and "thought it was being dealt with". After losing out on a £50k contract, I gave them another chance and asked for some Chromebooks - this time they couldn't get the management licences sorted in the WEEKS it took to organise, so we told them to forget that too. They still keep phoning me up and, especially recently since they were taken over, are desperate for business and bugging the life out of me. Basically, guys... no.
Seems like XMA and Viglen will be perfect together...