Also if you want to scale horizontally, you probably want to scale on more than one datacenter (online provides that too).
Also, they are offering VPC by default, the nodes seem to have only one network interface which defaults to private network, and external traffic is routed to private network with specific firewall rules. Also, they are offering ip failover, I think you can attach or move external ips at runtime between servers without configuring anything on the nodes (just from API).
For online.net I know they are offering DDOS protection for higher priced servers, I'm now sure if they are supporting this for scaleway, but you can always reverse proxy from online.net server to scaleway to achieve horizontal scalability if this is an issue.
Good point that they seem to be missing multiple availability zones.
A lot can be forgiven at that price.
We are currently running on online's dedicated intel servers (among others), but we've kept an eye on their ARM offering...
Clicking through just lands me on the scaleway homepage. Can anybody shed some light on this? Clicking around their site and couldn't see any mention of it.
[1] http://www.online.net/img/carousel/cloud.jpg screengrab: http://imgur.com/cuvZlgb
They will however charge for IPs, and they are not auto-released when instances are destroyed, need to be done explicitly.
I wish (cheaper) IPv6 support would be available, for lots of experimenting I don't need a public expensive IPv4 addr...