Whilst the host is very cheap, with that will usually come some sort of additional problem.

For example, a lot of cheaper hosts have worse servers that won't actually handle the load of other servers.
I, personally, have had problems with this before - I had a 5GB server with a more expensive host, switched to a cheaper one and found myself lagging quite often and not offered the same quality service.

With most (I must stress not all of them) expensive servers, you generally get high-quality servers and excellent support (Like with BeastNode and BukkitHost in my experience)

Another problem I see with this host, whilst minor it is still apparent..
They charge an extra 20EUR per month just to have a managed server.

Taking BukkitHost as an easy example, that's only 5 more per month for the same service that I checked against (6GB Managed Server) yet if you take a look at the BukkitHost package, you would also get a dedicated IP (3EUR with Sergeathost so only now 2 cheaper than BukkitHost) and you also receive free MySQL databases, which would be worth the extra 2 per month.

So essentially, this host would be (For a 6GB managed server) just as expensive as BukkitHost, yet BukkitHost has a high reputation and is claimed to be an "expensive" host by lots of people.