A little more expensive than some other NL hosts but you get what you pay for.
Total setup time was 3 days after payment (the server was a custom setup), because we had to wait an extra day for the setup Jelle gave us a free upgrade (better CPU and HDDs) which was amazing seeing that the setup period wasn't that long anyway.
In the past 7 months we have had 2 small bits of downtime, 1 was scheduled - when they upgraded their datacenter and the other was due to a RAID card failure, which was promptly replaced in less than an hour. Their network is faultless.
We only have the free SLA yet Jelle responds within minutes, and his responses are always friendly and professional. However I haven't needed to contact support outside of business hours so I cannot vouch for that, but during business hours it's top notch.
I can't recommend ServerBoost enough, I'm 110% pleased. We/I have 5 servers in EU each with different providers and ServerBoost is by far my favourite and the one I recommend most.