At the moment there is still far too little support from other developers, the comparatively time-consuming initial setup and error messages.
In addition only a handful of developers and without sizes like AndyB, AddonLabs, XFA, XT etc. the addon makes no sense to me. It's a shame - if something should change in the support from other developers, I'll be happy to correct my rating upwards, but currently only 3 stars are there.
Edit:
Half a star less for using checkout codes to sell for free instead of offering straight away for free with no code nonsense.
