What is the sentiment of this news? Please choose an answer from {strong negative/moderately negative/mildly negative/neutral/mildly positive/moderately positive/strong positive}.
Text: Amazon has recently launched Amazon Marketing Stream (Beta), which is a cloud-powered solution that ultimately strives to improve conversion rates and RoAS for its sellers. While the initial responses from the "Beta" group are positive, proclaiming higher conversion rates and lower ACOS, these benefits are unlikely to prove sustainable amid a broader rollout.
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