Webgility ‑ QBO & Xero Sync

I was terrified of migrating from Magento to Shopify since ECC handles all of my middleware communication. Yet, to my pleasant surprise, the changeover was painless. Webgility even gave me a couple of weeks on the new subscription for free so I could make sure everything was crossing over correctly.
One caveat, ECC uses slightly different language than QB, so sometimes initial mapping can be somewhat less than intuitive.
I also want to say their tech team is awesome. In the 2-3 years since we started with ECC, I have probably only talked to a few different techs. They always solve the problem, and will even remote-in to fix tricky issues.