[ktimespi]

This was my concern too. The whole point of using S3 as a file system instead of EBS / EFS (for me at least) is to minimize cost and I don't really see why I would use this instead of s3fs.

[avereveard]

Probably some tradeoff at high client count or if you seek into files to read partial data

[ktimespi]

s3fs can do partial reads too with range queries, I'm leaning more towards the tradeoff.