It might have a very strong cloud engine but if that is down you better hope that it also has the full Avira engine. I find cloud solutions to be very unreliable because they could just time out at anytime and you wouldn't know. They might be able to technically receive definitions faster than traditional AVs but they also take a longer time to come back with a verdict if the file is malicious or not.
Honestly if you are using Baidu for the Avira engines you are better off using Avira products itself because Avira also has it's own cloud and it's not really the main defense but to check suspicious files through the cloud to see if they match any signatures. Also Avira is by far the fastest responder to a Virus submission from my experience.
About the AV being 100% free, that means that they have to earn their income from somewhere else, AKA selling your data, and what's better than a cloud engine that sends everything it scans to the cloud for gathering data. If you're fine with this then you can go ahead! But for me I prefer to keep my data with me.
As many have said bitdefender has a good free programme and they don't really bug you with a ton of ads and promotions. Another AV that is good is Avast, if you don't want any pop ups then you can enable gaming mode and no pop ups will appear, but note that if there is any malicious application detected Avast will also stay silent, it will still resolve the threat but it won't inform you.
So far I've been using many AVs and Avast was one of the first ones that I tested out, after going one round with Avira, bitdefender, Qihoo and several others I've ultimately come back to Avast and I think that I love it the most!