Please note that, if you are not going to use 100GB for a project (for example, storing your own stuff) you are better off grouping them as it is $6 per 100GB (not $0.06 per GB) for stored data. Transfer out is $0.06/GB though. So if you have 101GB (I think the GB is is GigaByte right?) it should cost you $12 a month.

But if you are just wandering with personal backups they have plans $10 a month for 100GB+ (with affiliation program to earn up to 50GBs of data, but that part are given to free users as well) so that is pretty close to $6 for 100GB, and $4 for 40GB of transfer-out. Since they claim they are using very similar or just the same system for their service in SpiderOak, you can bet they are just the same thing.

Or just go with free account and grab 2GB + whatever I get from affiliation.

On the other hand, since they are saying it's a trade-off of low-latency for price. If their data about s3 is correct, that it should be slower than s3 in the way that s3 has 3 drives to read from versus 3 drives but parity shared so effectively just one fast enough.