I've been using SynapseGlobal as well (in fact I still use it as a backup/mirrored server of my production one).
My main server is with Lylix.
Must say synapse Global is a good service provider but I've had quite of, in a business inacceptable, interruptions, DDoS attacks and other unexplainable problems that drove me crazy.
Later on they moved their infrastructure to the new provider and it seemed to be better.
The main reason why I left them (as a production server) is that a call via their server in Munich (Germany) to some European pstn networks in most cases had more disturbances like delays, echo, crackings..(despite very low ping) than Lylix server in US.It might be that I was just unlucky, will give another try one of upcoming days.
Besides I'm wondering that nobody has mentioned Lylix which offers excellent service.
Must also say that Synapse Global has very good customer support (with Lylyx I have never had any prob so I don't know quality of their support
)
Synapse Global also has slightly better offer (more RAM, HDD, traffic limits..) than Lylix but the second one is more stabel IMO.