I have only had limited interaction with the module, but I do not like it. I have a customer that uses it with thirty bees and we have had nothing but problems out of it. They used it with PrestaShop first, then we migrated them to thirty bees about 6 months ago. The module was a disaster under PrestaShop as well. I am not sure the extent of all the problems it had, I know they spent several months working with their support for different issues.
The one that I have found the most solid is the PresTeamShop one. We have several people using it and it seems to work well without any major bugs.