Ascent has consistently had a good chunk of unhappy customers.
I think the only two decent field service add-ons are JobOps and MSI Data. If a company does manufacturing and then service, JobOps is their first stop. But for distribution companies (like this one), MIS is probably first to check out.
They did a demo for 90 Minds last April. I had an extensive discussion with them at Summit last year, too. We haven't done a deal with it yet, but we are looking for one. MSI has their service app separate from MAS (they also integrate with Macola, TomTom and Viewpoint.). They use Bob Richter's MAS integration engine (In-synch) to handle the integration, including IM and Pricing. The advantage of this approach is the same service app gets beat up by customers in a number of the ERP situations, and as long as it's handling the modest integration touchpoints to MAS, there isn't an issue.
It also means that MSI is pretty independent of Sage 100 upgrades.
Here is the recorded demo:
http://bit.ly/1mv76t4