Any antivirus/antimalware tool is going to be good or bad depending on the type of malware in the wild in the places where people use it. If , for example, chinese people use other products, those are going to be better at dealing with stuff than the ones europeans/americans might use since Rising may get more samples than Avast. Any product like this will only get better if the community grows so more and more samples are submitted. Of course, being able to submit samples also means helping you AV products with a behavior analyser/blocker or a HIPS product which are designed to contain 0-day threats.