We have someone moving to Sage 100 using only SO and AR.  We have GL activated because it fussed at us otherwise, but won't really be using it.  As hard as it is to believe, they do all of this in their legacy system (and will in Sage 100), then do manual entries to their QB system.  

That said, we are considering doing their migration mid-June, during the slowest part of their month.  I wouldn't normally recommend that but with no real impact on the GL, I don't see an enormous risk in doing it mid-month.

Is there one I'm just not seeing?

Thanks.