AR: Google Shopping Feed Pro

I've been using this app for approximately a year now, and I am extremely satisfied with it. During this time, I encountered some internal complications that required a reinstallation and reaching out to the support team for assistance. The support I received was incredibly helpful and responsive. The app has been functioning perfectly for me 100% of the time. With the level of support and responsiveness I've experienced, I can't give anything less than 5 stars.

UPDATE:
I've just recently also had a lot of customized requets to make it adjustable for affiliate sites, marketplaces ect and the help and respons time from Improve / Apps Robots HAVE BEEN OUTSTANDING. Fastest and easiest experience I've ever had.