Mannequin Madness review for Bold QuickBooks Sync Pro

I used this app for many years and was a happy customer. But recently they did a "upgrade" and it no longer performs properly. Tech support is very limited - difficult to get anyone on the phone, and when you do they are inexperienced and have to escalate to the next level. Still waiting for an answer. So in the meantime I am looking for alternatives. If you have products from multiple vendors and need them to go to specific line items instead of ALL into ONE line item, DO NOT USE THIS APP.