I like the product and the people very much! I have 12 customers using it, plus us. If you have any sort of complicated tax jurisdictions, it is sooo nice! Just for the city of Minneapolis, there are four separate jurisdictions - state, city, county and a special transit one. You can't base the tax schedule on the city name because lots of suburbs use Minneapolis but aren't in the city or county jurisdiction. Can't go by zip code because when the transit tax took effect, there were about two pages of zip codes that were only partially in the jurisdiction. In other words, a nightmare!
We have an Accpac client that has had some issues but it works differently for Accpac - a separate window pops up with the tax detail - but in MAS, you get a slight splash screen as it goes out and calculates the tax based on the ship-to address then it returns it to the tax field. Sweet!