No glitches, nothing to improve on this plugin just simply does what it is supposed to do. Further to that as a business man this plugin is able to relieve me from transposting every single sale in whmcs to quickbooks freeing up about 15 hours per quarter and allowing me to generate about $5000 more in income not having to waste time moving stuff from one system to another. It's simply brilliant. Their tech support should you need it seems to answer every question within minutes. 5 stars from me!