the only differences between their "Enterprise" line (really their premiere line) and Kimsufi/SoYouStart are -
1. some Kimsufi/SYS servers don't have IPMI or KVM over IP without paying a *hideous* amount per month to get one connected to the server
2. Enterprise servers all come with the ability to spend money on a *one-time* purchase of a fairly large IPv4 block, not sure what the biggest one is but I have two /27s - no recurring monthly cost and the up-front isn't too bad. Other servers allow you to buy IPs but the cost is ongoing